下面是需要传入的参数的格式及要求：
package com.quanzhen.test;
import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import javax.activation.MimetypesFileTypeMap;
/**
* java通过模拟post方式提交表单实现图片上传功能实例
* 其他文件类型可以传入 contentType 实现
*/
public class Test {
public static void main(String[] args) {
testUploadImage();
}
/**
* 测试上传png图片
*
*/
public static void testUploadImage(){
String url = "http://localhost:8080/reader/book/insertAPIBook";
String lunboimg = "C:/Users/Administrator/Desktop/123.jpg";
String reader = "C:/Users/Administrator/Desktop/reader.txt";
Map<String, String> textMap = new HashMap<String, String>();
//可以设置多个input的name，value
textMap.put("author", "谢霆锋");
textMap.put("bookName", "坏蛋是怎么练成的");
//设置file的name，路径
Map<String, String> fileMap = new HashMap<String, String>();
fileMap.put("lunboimg", lunboimg);
fileMap.put("file", reader);
String contentType = "";//image/png
String ret = formUpload(url, textMap, fileMap,contentType);
System.out.println(ret);
//{"status":"0","message":"add succeed","baking_url":"group1/M00/00/A8/CgACJ1Zo-LuAN207AAQA3nlGY5k151.png"}
}
/**
* 上传图片
* @param urlStr
* @param textMap
* @param fileMap
* @param contentType 没有传入文件类型默认采用application/octet-stream
* contentType非空采用filename匹配默认的图片类型
* @return 返回response数据
*/
@SuppressWarnings("rawtypes")
public static String formUpload(String urlStr, Map<String, String> textMap,
Map<String, String> fileMap,String contentType) {
String res = "";
HttpURLConnection conn = null;
// boundary就是request头和上传文件内容的分隔符
String BOUNDARY = "---------------------------123821742118716";
try {
URL url = new URL(urlStr);
conn = (HttpURLConnection) url.openConnection();
conn.setConnectTimeout(5000);
conn.setReadTimeout(30000);
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setUseCaches(false);
conn.setRequestMethod("POST");
conn.setRequestProperty("Connection", "Keep-Alive");
conn.setRequestProperty("User-Agent",
"Mozilla/5.0 (Windows; U; Windows NT 6.1; zh-CN; rv:1.9.2.6)");
conn.setRequestProperty("Content-Type",
"multipart/form-data; boundary=" + BOUNDARY);
OutputStream out = new DataOutputStream(conn.getOutputStream());
// text
if (textMap != null) {
StringBuffer strBuf = new StringBuffer();
Iterator iter = textMap.entrySet().iterator();
while (iter.hasNext()) {
Map.Entry entry = (Map.Entry) iter.next();
String inputName = (String) entry.getKey();
String inputValue = (String) entry.getValue();
if (inputValue == null) {
continue;
}
strBuf.append("
").append("--").append(BOUNDARY)
.append("
");
strBuf.append("Content-Disposition:form-data;name=""
+ inputName + ""
");
strBuf.append(inputValue);
}
out.write(strBuf.toString().getBytes());
}
// file
if (fileMap != null) {
Iterator iter = fileMap.entrySet().iterator();
while (iter.hasNext()) {
Map.Entry entry = (Map.Entry) iter.next();
String inputName = (String) entry.getKey();
String inputValue = (String) entry.getValue();
if (inputValue == null) {
continue;
}
File file = new File(inputValue);
String filename = file.getName();
//没有传入文件类型，同时根据文件获取不到类型，默认采用application/octet-stream
contentType = new MimetypesFileTypeMap().getContentType(file);
//contentType非空采用filename匹配默认的图片类型
if(!"".equals(contentType)){
if (filename.endsWith(".png")) {
contentType = "image/png";
}else if (filename.endsWith(".jpg") || filename.endsWith(".jpeg") || filename.endsWith(".jpe")) {
contentType = "image/jpeg";
}else if (filename.endsWith(".gif")) {
contentType = "image/gif";
}else if (filename.endsWith(".ico")) {
contentType = "image/image/x-icon";
}
}
if (contentType == null || "".equals(contentType)) {
contentType = "application/octet-stream";
}
StringBuffer strBuf = new StringBuffer();
strBuf.append("
").append("--").append(BOUNDARY)
.append("
");
strBuf.append("Content-Disposition:form-data;name=""
+ inputName + "";filename="" + filename
+ ""
");
strBuf.append("Content-Type:" + contentType + "
");
out.write(strBuf.toString().getBytes());
DataInputStream in = new DataInputStream(
new FileInputStream(file));
int bytes = 0;
byte[] bufferOut = new byte[1024];
while ((bytes = in.read(bufferOut)) != -1) {
out.write(bufferOut, 0, bytes);
}
in.close();
}
}
byte[] endData = ("
--" + BOUNDARY + "--
").getBytes();
out.write(endData);
out.flush();
out.close();
// 读取返回数据
StringBuffer strBuf = new StringBuffer();
BufferedReader reader = new BufferedReader(new InputStreamReader(
conn.getInputStream()));
String line = null;
while ((line = reader.readLine()) != null) {
strBuf.append(line).append("
");
}
res = strBuf.toString();
reader.close();
reader = null;
} catch (Exception e) {
System.out.println("发送POST请求出错。" + urlStr);
e.printStackTrace();
} finally {
if (conn != null) {
conn.disconnect();
conn = null;
}
}
return res;
}
}
下面是Java后台接收的接口
参数是以流的形式，所以后台也要用流的形式接收
@RequestMapping(value = "/insertAPIBook", method = RequestMethod.POST)
@ResponseBody
public String insertAPIBook(DefaultMultipartHttpServletRequest request) {
try {
// 用DefaultMultipartHttpServletRequest来接收，参数会自动封装到request作用域中
//普通参数，直接用request.getParameter("bookName")，文件接收如下
Book book = new Book();
if(StringUtil.isNotEmpty(request.getParameter("bookName"))){
book.setBookName(request.getParameter("bookName"));
}
if(StringUtil.isNotEmpty(request.getParameter("author"))){
book.setAuthor(request.getParameter("author"));
}
MultiValueMap<String, MultipartFile> mvmFs = request.getMultiFileMap();
MultipartFile file=null;
MultipartFile lunboimg=null;
MultipartFile headimg=null;
for (String key : mvmFs.keySet()) {
System.out.println("----属性名---" + key);
if("file".equals(key)){
file=request.getFile(key);
}
if("lunboimg".equals(key)){
lunboimg=request.getFile(key);
}
if("headimg".equals(key)){
headimg=request.getFile(key);
}
}
//下面就是调用和form表单提交一样的接口，没啥区别
bookServiceImpl.insertBook(everychapterfee, paychapter, book, file, lunboimg, headimg, request, tag);
return "ok";
}catch (Exception e){
e.printStackTrace();
return "fail";
}
}
这就可以接收文件了，亲测是可以的，切记不要把参数拼接在url里面，否则会出现乱码