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hmkcodehmkcode
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servlet file upload
servlet file upload
1 parent a4a2aa3 commit 568f012

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‎servlet-file-upload/.classpath‎

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<?xml version="1.0" encoding="UTF-8"?>
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<classpath>
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<classpathentry kind="src" path="src/test/java" output="target/test-classes" including="**/*.java"/>
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<classpathentry kind="src" path="src/main/java" including="**/*.java"/>
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<classpathentry kind="output" path="target/classes"/>
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<classpathentry kind="var" path="M2_REPO/javax/servlet/javax.servlet-api/3.1.0/javax.servlet-api-3.1.0.jar"/>
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<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
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<classpathentry kind="var" path="M2_REPO/commons-fileupload/commons-fileupload/1.3/commons-fileupload-1.3.jar"/>
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<classpathentry kind="var" path="M2_REPO/commons-io/commons-io/2.4/commons-io-2.4.jar"/>
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<classpathentry kind="var" path="M2_REPO/com/fasterxml/jackson/core/jackson-core/2.2.2/jackson-core-2.2.2.jar"/>
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<classpathentry kind="var" path="M2_REPO/com/fasterxml/jackson/core/jackson-databind/2.2.2/jackson-databind-2.2.2.jar"/>
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<classpathentry kind="var" path="M2_REPO/com/fasterxml/jackson/core/jackson-annotations/2.2.2/jackson-annotations-2.2.2.jar"/>
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</classpath>

‎servlet-file-upload/pom.xml‎

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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.hmkcode</groupId>
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<artifactId>servlet-file-upload</artifactId>
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<version>1.0-SNAPSHOT</version>
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<packaging>jar</packaging>
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<name>servlet-file-upload</name>
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<url>http://maven.apache.org</url>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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</properties>
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<dependencies>
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<dependency>
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<groupId>javax.servlet</groupId>
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<artifactId>javax.servlet-api</artifactId>
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<version>3.1.0</version>
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</dependency>
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<dependency>
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<groupId>commons-fileupload</groupId>
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<artifactId>commons-fileupload</artifactId>
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<version>1.3</version>
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</dependency>
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<dependency>
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<groupId>commons-io</groupId>
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<artifactId>commons-io</artifactId>
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<version>2.4</version>
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</dependency>
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<dependency>
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<groupId>com.fasterxml.jackson.core</groupId>
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<artifactId>jackson-core</artifactId>
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<version>2.2.2</version>
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</dependency>
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<dependency>
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<groupId>com.fasterxml.jackson.core</groupId>
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<artifactId>jackson-databind</artifactId>
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<version>2.2.2</version>
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</dependency>
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<dependency>
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<groupId>com.fasterxml.jackson.core</groupId>
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<artifactId>jackson-annotations</artifactId>
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<version>2.2.2</version>
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</dependency>
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</dependencies>
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<build>
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<finalName>servlet-file-upload</finalName>
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<plugins>
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<plugin>
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<groupId>org.eclipse.jetty</groupId>
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<artifactId>jetty-maven-plugin</artifactId>
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<version>9.0.4.v20130625</version>
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</plugin>
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</plugins>
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</build>
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</project>

‎servlet-file-upload/src/main/java/com/hmkcode/FileUploadServlet.java‎

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package com.hmkcode;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.util.LinkedList;
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import java.util.List;
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import javax.servlet.ServletException;
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import javax.servlet.annotation.MultipartConfig;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import com.fasterxml.jackson.databind.ObjectMapper;
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import com.hmkcode.vo.FileMeta;
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//this to be used with Java Servlet 3.0 API
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@MultipartConfig
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public class FileUploadServlet extends HttpServlet {
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private static final long serialVersionUID = 1L;
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// this will store uploaded files
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private static List<FileMeta> files = new LinkedList<FileMeta>();
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/***************************************************
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* URL: /upload
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* doPost(): upload the files and other parameters
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****************************************************/
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protected void doPost(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException{
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// 1. Upload File Using Java Servlet API
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//files.addAll(MultipartRequestHandler.uploadByJavaServletAPI(request));
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// 1. Upload File Using Apache FileUpload
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files.addAll(MultipartRequestHandler.uploadByApacheFileUpload(request));
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// Remove some files
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while(files.size() > 20)
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{
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files.remove(0);
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}
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// 2. Set response type to json
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response.setContentType("application/json");
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// 3. Convert List<FileMeta> into JSON format
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ObjectMapper mapper = new ObjectMapper();
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// 4. Send resutl to client
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mapper.writeValue(response.getOutputStream(), files);
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}
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/***************************************************
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* URL: /upload?f=value
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* doGet(): get file of index "f" from List<FileMeta> as an attachment
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****************************************************/
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protected void doGet(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException{
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// 1. Get f from URL upload?f="?"
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String value = request.getParameter("f");
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// 2. Get the file of index "f" from the list "files"
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FileMeta getFile = files.get(Integer.parseInt(value));
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try {
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// 3. Set the response content type = file content type
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response.setContentType(getFile.getFileType());
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// 4. Set header Content-disposition
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response.setHeader("Content-disposition", "attachment; filename=\""+getFile.getFileName()+"\"");
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// 5. Copy file inputstream to response outputstream
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InputStream input = getFile.getContent();
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OutputStream output = response.getOutputStream();
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byte[] buffer = new byte[1024*10];
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for (int length = 0; (length = input.read(buffer)) > 0;) {
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output.write(buffer, 0, length);
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}
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output.close();
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input.close();
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}catch (IOException e) {
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e.printStackTrace();
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}
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}
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}

‎servlet-file-upload/src/main/java/com/hmkcode/MultipartRequestHandler.java‎

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package com.hmkcode;
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import java.io.IOException;
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import java.util.Collection;
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import java.util.LinkedList;
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import java.util.List;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.Part;
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import org.apache.commons.fileupload.FileItem;
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import org.apache.commons.fileupload.FileUploadException;
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import org.apache.commons.fileupload.disk.DiskFileItemFactory;
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import org.apache.commons.fileupload.servlet.ServletFileUpload;
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import com.hmkcode.vo.FileMeta;
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public class MultipartRequestHandler {
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public static List<FileMeta> uploadByJavaServletAPI(HttpServletRequest request) throws IOException, ServletException{
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List<FileMeta> files = new LinkedList<FileMeta>();
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// 1. Get all parts
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Collection<Part> parts = request.getParts();
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// 2. Get paramter "twitter"
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String twitter = request.getParameter("twitter");
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// 3. Go over each part
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FileMeta temp = null;
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for(Part part:parts){
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// 3.1 if part is multiparts "file"
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if(part.getContentType() != null){
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// 3.2 Create a new FileMeta object
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temp = new FileMeta();
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temp.setFileName(getFilename(part));
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temp.setFileSize(part.getSize()/1024 +" Kb");
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temp.setFileType(part.getContentType());
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temp.setContent(part.getInputStream());
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temp.setTwitter(twitter);
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// 3.3 Add created FileMeta object to List<FileMeta> files
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files.add(temp);
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}
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}
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return files;
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}
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public static List<FileMeta> uploadByApacheFileUpload(HttpServletRequest request) throws IOException, ServletException{
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List<FileMeta> files = new LinkedList<FileMeta>();
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// 1. Check request has multipart content
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boolean isMultipart = ServletFileUpload.isMultipartContent(request);
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FileMeta temp = null;
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// 2. If yes (it has multipart "files")
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if(isMultipart){
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// 2.1 instantiate Apache FileUpload classes
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DiskFileItemFactory factory = new DiskFileItemFactory();
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ServletFileUpload upload = new ServletFileUpload(factory);
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// 2.2 Parse the request
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try {
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// 2.3 Get all uploaded FileItem
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List<FileItem> items = upload.parseRequest(request);
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String twitter = "";
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// 2.4 Go over each FileItem
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for(FileItem item:items){
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// 2.5 if FileItem is not of type "file"
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if (item.isFormField()) {
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// 2.6 Search for "twitter" parameter
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if(item.getFieldName().equals("twitter"))
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twitter = item.getString();
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} else {
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// 2.7 Create FileMeta object
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temp = new FileMeta();
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temp.setFileName(item.getName());
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temp.setContent(item.getInputStream());
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temp.setFileType(item.getContentType());
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temp.setFileSize(item.getSize()/1024+ "Kb");
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// 2.7 Add created FileMeta object to List<FileMeta> files
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files.add(temp);
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}
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}
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// 2.8 Set "twitter" parameter
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for(FileMeta fm:files){
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fm.setTwitter(twitter);
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}
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} catch (FileUploadException e) {
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e.printStackTrace();
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}
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}
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return files;
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}
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// this method is used to get file name out of request headers
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//
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private static String getFilename(Part part) {
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for (String cd : part.getHeader("content-disposition").split(";")) {
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if (cd.trim().startsWith("filename")) {
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String filename = cd.substring(cd.indexOf('=') + 1).trim().replace("\"", "");
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return filename.substring(filename.lastIndexOf('/') + 1).substring(filename.lastIndexOf('\\') + 1); // MSIE fix.
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}
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}
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return null;
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}
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}

‎servlet-file-upload/src/main/java/com/hmkcode/vo/FileMeta.java‎

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package com.hmkcode.vo;
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import java.io.InputStream;
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import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
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@JsonIgnoreProperties({"content"})
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public class FileMeta {
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private String fileName;
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private String fileSize;
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private String fileType;
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private String twitter;
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private InputStream content;
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public String getFileName() {
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return fileName;
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}
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public void setFileName(String fileName) {
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this.fileName = fileName;
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}
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public String getFileSize() {
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return fileSize;
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}
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public void setFileSize(String fileSize) {
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this.fileSize = fileSize;
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}
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public String getFileType() {
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return fileType;
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}
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public void setFileType(String fileType) {
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this.fileType = fileType;
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}
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public InputStream getContent(){
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return this.content;
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}
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public void setContent(InputStream content){
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this.content = content;
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}
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public String getTwitter(){
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return this.twitter;
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}
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public void setTwitter(String twitter){
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this.twitter = twitter;
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}
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@Override
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public String toString() {
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return "FileMeta [fileName=" + fileName + ", fileSize=" + fileSize
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+ ", fileType=" + fileType + "]";
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}
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}

‎servlet-file-upload/src/main/webapp/WEB-INF/web.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xmlns="http://java.sun.com/xml/ns/javaee"
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xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
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xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
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id="WebApp_ID" version="3.0">
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<display-name>Archetype Created Web Application</display-name>
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<welcome-file-list>
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<welcome-file>index.html</welcome-file>
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</welcome-file-list>
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<servlet>
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<servlet-name>upload</servlet-name>
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<servlet-class>com.hmkcode.FileUploadServlet</servlet-class>
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</servlet>
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<servlet-mapping>
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<servlet-name>upload</servlet-name>
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<url-pattern>/upload</url-pattern>
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</servlet-mapping>
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</web-app>

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