Java模拟form表单提交普通参数和⽂件下⾯是需要传⼊的参数的格式及要求：
package st;
import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
printformimport java.io.FileInputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.HttpURLConnection;
import java.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 = "localhost:8080/reader/book/insertAPIBook";
String lunboimg = "C:/Users/Administrator/Desktop/123.jpg";
String reader = "C:/Users/Administrator/";
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 OutputStream());
// text
if (textMap != null) {
StringBuffer strBuf = new StringBuffer();
Iterator iter = Set().iterator();
while (iter.hasNext()) {
Map.Entry entry = (Map.Entry) ();
String inputName = (String) Key();
String inputValue = (String) Value();
if (inputValue == null) {
continue;
}
strBuf.append("\r\n").append("--").append(BOUNDARY)
.append("\r\n");
strBuf.append("Content-Disposition:form-data;name=\""
+ inputName + "\"\r\n\r\n");
strBuf.append(inputValue);
}
out.String().getBytes());
}
// file
if (fileMap != null) {
Iterator iter = Set().iterator();
while (iter.hasNext()) {
Map.Entry entry = (Map.Entry) ();
String inputName = (String) Key();
String inputValue = (String) Value();
if (inputValue == null) {
continue;
}
File file = new File(inputValue);
String filename = Name();
//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 (dsWith(".png")) {
contentType = "image/png";
}else if (dsWith(".jpg") || dsWith(".jpeg") || dsWith(".jpe")) {                            contentType = "image/jpeg";
}else if (dsWith(".gif")) {
contentType = "image/gif";
}else if (dsWith(".ico")) {
contentType = "image/image/x-icon";
}
}
if (contentType == null || "".equals(contentType)) {
contentType = "application/octet-stream";
}
StringBuffer strBuf = new StringBuffer();
strBuf.append("\r\n").append("--").append(BOUNDARY)
.append("\r\n");
strBuf.append("Content-Disposition:form-data;name=\""
+ inputName + "\";filename=\"" + filename
+ "\"\r\n");
strBuf.append("Content-Type:" + contentType + "\r\n\r\n");
out.String().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 = ("\r\n--" + BOUNDARY + "--\r\n").getBytes();
out.write(endData);
out.flush();
out.close();
// 读取返回数据
StringBuffer strBuf = new StringBuffer();
BufferedReader reader = new BufferedReader(new InputStreamReader(
String line = null;
while ((line = adLine()) != null) {
strBuf.append(line).append("\n");
}
res = String();
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Parameter("bookName")，⽂件接收如下
Book book = new Book();
if(StringUtil.Parameter("bookName"))){
book.Parameter("bookName"));
}
if(StringUtil.Parameter("author"))){
book.Parameter("author"));
}
MultiValueMap<String, MultipartFile> mvmFs = MultiFileMap();
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(key);
}
if("lunboimg".equals(key)){
File(key);
}
if("headimg".equals(key)){
File(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

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