基于Java中两种jersey文件上传方式

本文将带领大家使用基于JAX-RS REST风格的实现Jersey来上传文件到服务器制定的文件夹，如果是图片并读取显示出该图片。

准备工作：准备一个form表单，有两个字段，一个是type=”file”和type=”text”,并且表单需要使用POST方式提交。注意改表单需要使用multipart/form-data。该项目使用netbeans8.0和glassfish4.0开发和运行。并且使用maven管理该工程；需要在您的C盘建立一个文件夹，用来存储上传的文件。如C:\Newsportal\article_images开发环境：1 创建工程在你项目空白处右键-》点击新建项目

2 在创建的项目中选择maven-》点击右侧web应用程序

3 填写工程的名字和maven的组ID和包名

4 选择该项目的运行环境为服务器Glassfish server

5 最后点击完成
准备搭建jersey的运行环境：
1 配置maven需要依赖包，maven的pom文件依赖如下：

    4.0.0
    com.vi8
    jerseyUploadDemo
    1.0-SNAPSHOT
    war
    jerseyUploadDemo

    jersey上传文件DMEO


    ${project.build.directory}/endorsed
    UTF-8




        org.glassfish.jersey.core
        jersey-server
        2.0
        jar
        provided


        org.glassfish.jersey.ext
        jersey-mvc-jsp
        2.0
        jar
        provided


        org.glassfish.jersey.media
        jersey-media-json-jackson
        2.0
        jar
        provided



        org.glassfish.jersey.media
        jersey-media-multipart
        2.0
        provided



        commons-io
        commons-io
        2.4



        javax
        javaee-web-api
        7.0
        provided






        org.apache.maven.plugins
        maven-compiler-plugin
        3.1

            1.7
            1.7

            ${endorsed.dir}




        org.apache.maven.plugins
        maven-war-plugin
        2.3

            false



        org.apache.maven.plugins
        maven-dependency-plugin
        2.6


            validate

                copy


                ${endorsed.dir}
                true


                    javax
                    javaee-endorsed-api
                    7.0
                    jar









2 配置web.xml用以支持jersey，配置如下:


    JerseyFilter
    org.glassfish.jersey.servlet.ServletContainer

        javax.ws.rs.Application

        com.vi8.upload.MyApplication


        jersey.config.servlet.filter.staticContentRegex
        /(img|css|js|font)/.*


        jersey.config.servlet.filter.forwardOn404
        true


        jersey.config.server.mvc.templateBasePath.jsp
        /WEB-INF/pages



    JerseyFilter
    /*


    index.jsp


3 编写上面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);
    }
}
以上步骤基本就是jersey运行环境准备工作，接下开始讨论文件如何上传的。
jersey文件上传：
1 文件上传的Resource类，你可以理解是spring mvc中控制器。UploadImageResource.java清单代码
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;

@Path(“upload”)
public class UploadImageResource {

    /**
     * Constants operating w来源gaodaimacom搞#^代%!码&网ith 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”;

    /**
     * 第一种方式上传
     *
     * @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的文件写入操作
        FileUtils.copyInputStreamToFile(fileInputStream, file);
        //原来自己的文件写入操作
        //saveFile(fileInputStream, file);
    } catch (IOException ex) {
        Logger.getLogger(UploadImageResource.class.getName()).log(Level.SEVERE, null, ex);
    }

    return “images/” + imageName;
    }

    /**
     * *
     * 第二种方式上传使用FormDataMultiPart 获取表单数据
     *
     * @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 {
    //获取文件流
    FormDataBodyPart filePart = form.getField(“file”);
    //获取表单的其他数据
    FormDataBodyPart usernamePart = form.getField(“username”);

    //ContentDisposition headerOfFilePart = filePart.getContentDisposition();
    //把表单内容转换成流
    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 {
        //保存文件
        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;
    }

    /**
     *
     * 不从web服务器去读图片,在磁盘某个目录的文件可以通过流的方式去获取 ,通过 response.getOutputStream()放回数据
     *
     * @param imageName image-name
     * @param type extension of image
     * @param response [email protected] 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());
    }
    }

    // 保存文件信息到磁盘
    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();
    }
    }
}