jersey MULTIPART 上传文件

使用jersey上传混合key个file的数据。首先请认真研读官方实例 https://github.com/jersey/jersey/tree/2.19/examples/multipart-webapp

1、配置pom.xml，加入jersey-media-multipart

        <dependency>
            <groupId>org.glassfish.jersey.media</groupId>
            <artifactId>jersey-media-multipart</artifactId>
        </dependency>

2、配置serlet入口，web.xml 文件

    <servlet>
        <servlet-name>Jersey Web Application</servlet-name>
        <servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
        <init-param>
            <param-name>jersey.config.server.provider.packages</param-name>
            <param-value>com.hangyu.dpim</param-value>
        </init-param>
       ------ 根据实际情况修改value的值 -------
        <init-param>
            <param-name>javax.ws.rs.Application</param-name>
            <param-value>com.hangyu.dpim.MyApplication</param-value>
        </init-param>

        <load-on-startup>1</load-on-startup>
    </servlet>

3、编写com.hangyu.dpim.MyApplication类，com.hangyu.dpim.User是会用到该属性的类

package com.hangyu.dpim;

import javax.ws.rs.ApplicationPath;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.core.Response;

import org.glassfish.jersey.media.multipart.MultiPartFeature;
import org.glassfish.jersey.server.ResourceConfig;

import com.hangyu.dpim.domain.Test;
import com.hangyu.dpim.util.RequestResponseUtil;


@ApplicationPath("/")
public class MyApplication extends ResourceConfig {

    public MyApplication() {
        super(com.hangyu.dpim.User.class, MultiPartFeature.class);
    }
    
}

4、编写接口上传文件

    @Path("/upload-avatar")
    @POST
    @Consumes(MediaType.MULTIPART_FORM_DATA)
    @Produces(MediaType.APPLICATION_JSON)
    public Response uploadAvatar(
            @FormDataParam("file") String fileString,
            @FormDataParam("file") InputStream fis,
            @FormDataParam("file") FormDataContentDisposition fileDisposition,
            ) throws IOException{
        
        String fullFileName = fileDisposition.getFileName();
        String extension = fullFileName.substring(fullFileName.indexOf(".")+1,fullFileName.length()).toLowerCase();
        
        
        String filePath = FileUtil.writeAvatar(fis, userIDString, extension);
        
        return RequestResponseUtil.build200CommonResponse();
    }

FileUtil.writeAvatar方法，不仅要保证文件是存在的，还要检查文件夹也是存在的

private static String dirString = "/var/project/dpim";

public static void writeFile(InputStream fis, String path) throws IOException{
        System.out.println("path:"+path);
        File file = new File(path);
        if (!file.exists()){
            file.createNewFile();
        }
        OutputStream fos = new FileOutputStream(file);
        byte[] buf = new byte[1024];
        while ((fis.read(buf)) != -1){
            fos.write(buf);
        }
        
        fos.close();
        fis.close();
    }

    public static String  writeAvatar(InputStream fis, String userID, String extension) throws IOException{
        String dirPath = dirString + "/" + userID;
        File dir = new File(dirPath);
        if (!dir.exists()){
            dir.mkdir();
        }
         
        String path = dirPath + "/avatar." + extension;
        writeFile(fis, path);
        
        return path;
    }