用上传文件的类 MultipartFile 处理上传请求，发现总是报错： Spring MVC-Request method 'POST' not supported: org.springframework.web.servlet.PageNotFound handleHttpRequestMethodNotSupported           

去掉相应的MultipartFile则错误消失，debug源码，分别试了好多修改方法：

  1. 从request里去获取MultipartFile对象。

public String uploadPics(@RequestParam(value = "type", required = true) String type,HttpServletRequest request) {    

    ....    

    // 检测是否为上传请求    

    String contentType = request.getContentType();    

    if (contentType != null && contentType.toLowerCase().startsWith("multipart/")) {        

    MultipartHttpServletRequest multipartRequest =  WebUtils.getNativeRequest(request, MultipartHttpServletRequest.class);        

    MultipartFile file = multipartRequest.getFile("file");         

     ....    

     }    

    ....

}

2.加拦截器，说是需要隐藏post方法 org.springframework.web.filter.HiddenHttpMethodFilter

发现还是不行，最后追本溯源，发现缺少相应的拦截器，就是处理MultipartFile的文件的时候，需要单独配置一个拦截器：

    <beans:bean id="multipartResolver"

          class="org.springframework.web.multipart.commons.CommonsMultipartResolver">

        <!-- 设置上传文件的最大尺寸为1MB -->

        <beans:property name="maxUploadSize" value="10000000">

        </beans:property>

    </beans:bean>

这个拦截器也是

package org.springframework.web.multipart.commons;

加入的功能，加入之后，以上错误消失。

public class FileUploadUtil {

    private static Logger logger = LoggerFactory.getLogger(FileUploadUtil.class);


    public static String uploadUrl = "https://elongcdn.com/***";

    public static String testUploadUrl = "http://1*3:8080/i/upload";


    public static HttpClient httpclient = HttpClients.createDefault();


    public static String upload(String path) {

        try {


            MultipartEntityBuilder multipartEntityBuilder = MultipartEntityBuilder.create();

            multipartEntityBuilder

                    .addBinaryBody("file", new File(path))

                    .setMode(HttpMultipartMode.RFC6532);


            HttpPost httpPost = new HttpPost(uploadUrl);

            httpPost.getParams().setParameter(HttpMethodParams.SO_TIMEOUT, 600000);

            httpPost.setEntity(multipartEntityBuilder.build());

            HttpResponse httpResponse = null;

            httpResponse = httpclient.execute(httpPost);

            HttpEntity httpEntity = httpResponse.getEntity();

            String content = EntityUtils.toString(httpEntity);

            logger.info(content);

            return content;

        } catch (Exception e) {

            e.printStackTrace();

            return "";

        }

    }

}

期间有未指定host错误，原因是上传接口需要加http://，否则找不到

学着温习了下httpclient

package com.elong.web.flight.service.utils;


import org.apache.http.HttpEntity;

import org.apache.http.HttpResponse;

import org.apache.http.client.HttpClient;

import org.apache.http.client.methods.HttpPost;

import org.apache.http.entity.mime.MultipartEntityBuilder;

import org.apache.http.entity.mime.content.FileBody;

import org.apache.http.impl.client.DefaultHttpClient;

import org.apache.http.params.CoreConnectionPNames;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;


import java.io.*;


/**

 * 往inf-img图片中心上传文件的专用类

 */

public class FileUploadUtil {

    private static Logger logger = LoggerFactory.getLogger(FileUploadUtil.class);


    public static final String url = "http://192.168.15.43:8080/i/upload";

    public static HttpClient httpClient = new DefaultHttpClient();


    public static String upload(String path) {

        File upload = new File(path);

        HttpPost httpPost = new HttpPost(url);

        try {

            FileBody bin = new FileBody(new File(path));

            HttpEntity reqEntity = MultipartEntityBuilder.create()

                    // 相当于<input type="file" name="file"/>

                    .addPart("file", bin)

                    .build();

            httpPost.setEntity(reqEntity);


            httpClient.getParams().setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, 60000);

            HttpResponse httpResponse = httpClient.execute(httpPost);

            logger.info("上传成功 " + path);

            InputStream is = null;

            HttpEntity entity = httpResponse.getEntity();

            if (entity != null) {

                is = entity.getContent();

            }

            StringBuffer sbf = new StringBuffer();

            if (is != null) {

                BufferedReader bf = new BufferedReader(new InputStreamReader(is, "utf-8"));

                String line;

                while ((line = bf.readLine()) != null) {

                    sbf.append(line);

                }

            }

            String data = sbf.toString();

            return data;

        } catch (IOException e) {

            return "";

        }


    }

}

package com.elong.web.flight.service.utils;


import org.apache.commons.httpclient.params.HttpMethodParams;

import org.apache.http.HttpEntity;

import org.apache.http.HttpResponse;

import org.apache.http.client.HttpClient;

import org.apache.http.client.methods.HttpPost;

import org.apache.http.entity.mime.HttpMultipartMode;

import org.apache.http.entity.mime.MultipartEntityBuilder;

import org.apache.http.impl.client.HttpClients;

import org.apache.http.util.EntityUtils;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;


import java.io.File;


/**

 * Created by user on 17/12/11.

 */

public class FileUploadUtil {

    private static Logger logger = LoggerFactory.getLogger(FileUploadUtil.class);


    public static String uploadUrl = "http://pavo.elongstatic.com/i/upload";

    public static String accessUrl = "http://pavo.elongstatic.com";

    public static String testUploadUrl = "http://192.168.15.43:8080/i/upload";


    public static HttpClient httpclient = HttpClients.createDefault();


    public static String upload(String path) {

        try {


            MultipartEntityBuilder multipartEntityBuilder = MultipartEntityBuilder.create();

            multipartEntityBuilder

                    .addBinaryBody("file", new File(path))

                    .setMode(HttpMultipartMode.RFC6532);


            HttpPost httpPost = new HttpPost(uploadUrl);

            httpPost.getParams().setParameter(HttpMethodParams.SO_TIMEOUT, 600000);

            httpPost.setEntity(multipartEntityBuilder.build());

            HttpResponse httpResponse = null;

            httpResponse = httpclient.execute(httpPost);

            HttpEntity httpEntity = httpResponse.getEntity();

            String content = EntityUtils.toString(httpEntity);

            logger.info(content);

            return content;

        } catch (Exception e) {

            e.printStackTrace();

            return "";

        }

    }

}