在該文件中，我將帶領大家使用基於JAX-RS REST風格的實現Jersey來上傳檔案到伺服器制定的資料夾,如果是圖片並讀取顯示出該圖片。

準備工作：

1. 準備一個form表單，有兩個欄位，一個是type="file"和type="text",並且表單需要使用POST方式提交。注意改表單需要使用multipart/form-data。
2. 該專案使用netbeans8.0和glassfish4.0開發和執行。並且使用maven管理該工程；
3. 需要在您的C盤建立一個資料夾，用來儲存上傳的檔案。如C:\Newsportal\article_images

開發環境：

1 建立工程 在你專案空白處右鍵-》點選新建專案

            

2 在建立的專案中選擇maven-》點選右側web應用程式

3 填寫工程的名字和maven的組ID和包名

4 選擇該專案的執行環境為伺服器Glassfish server

5 最後點選完成

準備搭建jersey的執行環境：

1 配置maven需要依賴包，maven的pom檔案依賴如下：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.vi8</groupId>
    <artifactId>jerseyUploadDemo</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>war</packaging>
    <name>jerseyUploadDemo</name>
    <description>
	jersey上傳檔案DMEO
    </description>
    <properties>
	<endorsed.dir>${project.build.directory}/endorsed</endorsed.dir>
	<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>
    <dependencies>
	<!-- Jersey -->
	<dependency>
	    <groupId>org.glassfish.jersey.core</groupId>
	    <artifactId>jersey-server</artifactId>
	    <version>2.0</version>
	    <type>jar</type>
	    <scope>provided</scope>
	</dependency>
	<dependency>
	    <groupId>org.glassfish.jersey.ext</groupId>
	    <artifactId>jersey-mvc-jsp</artifactId>
	    <version>2.0</version>
	    <type>jar</type>
	    <scope>provided</scope>
	</dependency>
	<dependency>
	    <groupId>org.glassfish.jersey.media</groupId>
	    <artifactId>jersey-media-json-jackson</artifactId>
	    <version>2.0</version>
	    <type>jar</type>
	    <scope>provided</scope>
	</dependency>
	<!-- 上傳檔案需要該依賴-->
	<dependency>
	    <groupId>org.glassfish.jersey.media</groupId>
	    <artifactId>jersey-media-multipart</artifactId>
	    <version>2.0</version>
	    <scope>provided</scope>
	</dependency>
	<!-- 這個用於上傳檔案工具操作-->
	<dependency>
	    <groupId>commons-io</groupId>
	    <artifactId>commons-io</artifactId>
	    <version>2.4</version>
	</dependency>
	
	<dependency>
	    <groupId>javax</groupId>
	    <artifactId>javaee-web-api</artifactId>
	    <version>7.0</version>
	    <scope>provided</scope>
	</dependency>
    </dependencies>

    <build>
	<plugins>
	    <plugin>
		<groupId>org.apache.maven.plugins</groupId>
		<artifactId>maven-compiler-plugin</artifactId>
		<version>3.1</version>
		<configuration>
		    <source>1.7</source>
		    <target>1.7</target>
		    <compilerArguments>
			<endorseddirs>${endorsed.dir}</endorseddirs>
		    </compilerArguments>
		</configuration>
	    </plugin>
	    <plugin>
		<groupId>org.apache.maven.plugins</groupId>
		<artifactId>maven-war-plugin</artifactId>
		<version>2.3</version>
		<configuration>
		    <failOnMissingWebXml>false</failOnMissingWebXml>
		</configuration>
	    </plugin>
	    <plugin>
		<groupId>org.apache.maven.plugins</groupId>
		<artifactId>maven-dependency-plugin</artifactId>
		<version>2.6</version>
		<executions>
		    <execution>
			<phase>validate</phase>
			<goals>
			    <goal>copy</goal>
			</goals>
			<configuration>
			    <outputDirectory>${endorsed.dir}</outputDirectory>
			    <silent>true</silent>
			    <artifactItems>
				<artifactItem>
				    <groupId>javax</groupId>
				    <artifactId>javaee-endorsed-api</artifactId>
				    <version>7.0</version>
				    <type>jar</type>
				</artifactItem>
			    </artifactItems>
			</configuration>
		    </execution>
		</executions>
	    </plugin>
	</plugins>
    </build>
</project>
 

2 配置web.xml用以支援jersey，配置如下:

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd">
    <filter>
	<filter-name>JerseyFilter</filter-name>
	<filter-class>org.glassfish.jersey.servlet.ServletContainer</filter-class>
	<init-param>
	    <param-name>javax.ws.rs.Application</param-name>
	    <!--MyApplication.java jersey載入-->
	    <param-value>com.vi8.upload.MyApplication</param-value>
	</init-param>
	<init-param>
	    <param-name>jersey.config.servlet.filter.staticContentRegex</param-name>
	    <param-value>/(img|css|js|font)/.*</param-value>
	</init-param>
	<init-param>
	    <param-name>jersey.config.servlet.filter.forwardOn404</param-name>
	    <param-value>true</param-value>
	</init-param>
	<init-param>
	    <param-name>jersey.config.server.mvc.templateBasePath.jsp</param-name>
	    <param-value>/WEB-INF/pages</param-value>
	</init-param>
    </filter>
    <filter-mapping>
	<filter-name>JerseyFilter</filter-name>
	<url-pattern>/*</url-pattern>
    </filter-mapping>
    <welcome-file-list>
	<welcome-file>index.jsp</welcome-file>
    </welcome-file-list>
</web-app>
 

3 編寫上面web.xml用到的MyApplication.java 如下：

package com.vi8.upload;

import javax.ws.rs.ApplicationPath;
import org.glassfish.jersey.jackson.JacksonFeature;
import org.glassfish.jersey.media.multipart.MultiPartFeature;
import org.glassfish.jersey.server.ResourceConfig;
import org.glassfish.jersey.server.mvc.jsp.JspMvcFeature;

/**
 * qq: [email protected]
 *
 * @author Administrator
 */
@ApplicationPath("/")
public class MyApplication extends ResourceConfig {

    public MyApplication() {
	packages("com.vi8.upload.resources");
	register(JspMvcFeature.class);
	register(JacksonFeature.class);
	register(MultiPartFeature.class);
    }
}

以上步驟基本就是jersey執行環境準備工作，接下開始討論檔案如何上傳的。

jersey檔案上傳：

1 檔案上傳的Resource類，你可以理解是spring mvc中控制器。UploadImageResource.java清單程式碼

package com.vi8.upload.resources;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.util.Calendar;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.http.HttpServletResponse;
import javax.ws.rs.Consumes;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import org.apache.commons.io.FileUtils;
import org.glassfish.jersey.media.multipart.ContentDisposition;
import org.glassfish.jersey.media.multipart.FormDataBodyPart;
import org.glassfish.jersey.media.multipart.FormDataContentDisposition;
import org.glassfish.jersey.media.multipart.FormDataMultiPart;
import org.glassfish.jersey.media.multipart.FormDataParam;

/**
 * qq : 845885222
 *
 * @author Administrator
 */
@Path("upload")
public class UploadImageResource {

    /**
     * Constants operating with images
     */
    private static final String ARTICLE_IMAGES_PATH = "c:/Newsportal/article_images/";
    private static final String JPG_CONTENT_TYPE = "image/jpeg";
    private static final String PNG_CONTENT_TYPE = "image/png";

    /**
     * 第一種方式上傳
     *
     * @param fileInputStream
     * @param disposition
     * @return
     */
    @POST
    @Path("uploadimage1 ")
    @Consumes(MediaType.MULTIPART_FORM_DATA)
    public String uploadimage1(@FormDataParam("file") InputStream fileInputStream,
	    @FormDataParam("file") FormDataContentDisposition disposition) {
	String imageName = Calendar.getInstance().getTimeInMillis()
		+ disposition.getFileName();

	File file = new File(ARTICLE_IMAGES_PATH + imageName);
	try {
	    //使用common io的檔案寫入操作
	    FileUtils.copyInputStreamToFile(fileInputStream, file);
	    //原來自己的檔案寫入操作
	    //saveFile(fileInputStream, file);
	} catch (IOException ex) {
	    Logger.getLogger(UploadImageResource.class.getName()).log(Level.SEVERE, null, ex);
	}

	return "images/" + imageName;
    }

    /**
     * *
     * 第二種方式上傳 使用FormDataMultiPart 獲取表單資料
     *
     * @param form
     * @param response
     * @return
     * @throws UnsupportedEncodingException
     */
    @POST
    @Path("uploadimage2")
    @Consumes(MediaType.MULTIPART_FORM_DATA)
    @Produces(MediaType.APPLICATION_JSON)
    public String uploadimage2(FormDataMultiPart form, @Context HttpServletResponse response) throws UnsupportedEncodingException {
	//獲取檔案流
	FormDataBodyPart filePart = form.getField("file");
	//獲取表單的其他資料
	FormDataBodyPart usernamePart = form.getField("username");

	//ContentDisposition headerOfFilePart = filePart.getContentDisposition();
	//把表單內容轉換成流
	InputStream fileInputStream = filePart.getValueAs(InputStream.class);

	FormDataContentDisposition formDataContentDisposition = filePart.getFormDataContentDisposition();

	String source = formDataContentDisposition.getFileName();
	String result = new String(source.getBytes("ISO8859-1"), "UTF-8");

	System.out.println("formDataContentDisposition.getFileName()result " + result);

	String filePath = ARTICLE_IMAGES_PATH + result;
	File file = new File(filePath);
	System.out.println("file " + file.getAbsolutePath());
	try {
	    //儲存檔案
	    FileUtils.copyInputStreamToFile(fileInputStream, file);
//	saveFile(fileInputStream, file);
	} catch (IOException ex) {
	    Logger.getLogger(UploadImageResource.class.getName()).log(Level.SEVERE, null, ex);
	}
	System.out.println("" + "images/" + result);

	response.setCharacterEncoding("UTF-8");
	return "images/" + result;
    }

    /**
     *
     * 不從web伺服器去讀圖片,在磁碟某個目錄的檔案可以通過流的方式去獲取 ,通過 response.getOutputStream()放回資料
     *
     * @param imageName image-name
     * @param type extension of image
     * @param response {@link HttpServletResponse}
     * @throws IOException
     */
    @GET
    @Path("/images/{name}.{type}")
    public void showImg(@PathParam("name") String imageName,
	    @PathParam("type") String type,
	    @Context HttpServletResponse response)
	    throws IOException {
	System.out.println("showImg");
	try (InputStream in = new FileInputStream(ARTICLE_IMAGES_PATH
		+ imageName + "." + type)) {
	    FileUtils.copyFile(new File(ARTICLE_IMAGES_PATH + imageName + "." + type), response.getOutputStream());
//	    FileCopyUtils.copy(in, response.getOutputStream());
	}
    }

    // 儲存檔案資訊到磁碟 
    private void saveFile(InputStream uploadedInputStream, File file) {
	System.out.println("------saveFile-----");
	try {
	    OutputStream outpuStream = new FileOutputStream(file);
	    int read = 0;
	    byte[] bytes = new byte[1024];
//	    outpuStream = new FileOutputStream(new File(serverLocation));
	    while ((read = uploadedInputStream.read(bytes)) != -1) {
		outpuStream.write(bytes, 0, read);
	    }
	    outpuStream.flush();
	    outpuStream.close();
	} catch (IOException e) {
	    e.printStackTrace();
	}
    }
}

2 當然要測試你也許還需要準備一個帶有form表單的jsp檔案

<form action="${pageContext.request.contextPath}/upload/uploadimage2" method="post" enctype="multipart/form-data">
		<p>
		    檔案 :<input type="file" name="file"/><br />
		    使用者名稱: <input type="text" name="username"/><br />
		</p>
		<input type="submit" value="上傳" />
	    </form>

結果如下

最後貼上測試程式碼 在測試程式碼中會上面列出的有點出入.主要是顯示使用Viewable 實現:

1 程式碼託管在此：

3 當然如果下載連結失效,你還可以加入qq群： 438394076 討論