模拟前端上传文件请求, 接口可用用MultipartFile来接收文件，其他参数就以方法入参形式接收。
public Object uploadFile(@RequestParam("file") MultipartFile file, String filePn){
return null;
}
package com.hq.test.test;
import java.io.*;
import java.net.*;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;
public class Test {
private static String requestUrl = "http://localhost:8080/test/uploadFile";
private static final int TIME_OUT = 8 * 1000; //超时时间
private static final String CHARSET = "utf-8"; //编码格式
private static final String PREFIX = "--"; //前缀
private static final String BOUNDARY = UUID.randomUUID().toString(); //边界标识 随机生成
private static final String CONTENT_TYPE = "multipart/form-data"; //内容类型
private static final String LINE_END = "\r\n"; //换行
public static void main(String[] args) {
Map fileMap = new HashMap();
fileMap.put("Chrys.jpg", new File("D:\\Users\\Public\\Pictures\\Sample Pictures/Chrys.jpg"));
Map strParams = new HashMap();
strParams.put("filePn", 0);
strParams.put("source", 13);
String result = doPost(strParams, fileMap);
System.out.println(result);
}
public static String doPost(final Map<String, Object> strParams, final Map<String, File> fileParams){
HttpURLConnection conn = null;
try {
URL url = new URL(requestUrl);
conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("POST");
conn.setReadTimeout(TIME_OUT);
conn.setConnectTimeout(TIME_OUT);
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setUseCaches(false);//Post 请求不能使用缓存
//设置请求头参数
conn.setRequestProperty("Connection", "Keep-Alive");
conn.setRequestProperty("Charset", "UTF-8");
conn.setRequestProperty("Content-Type", CONTENT_TYPE+";boundary=" + BOUNDARY);
/**
* 请求体
*/
//上传参数
DataOutputStream dos = new DataOutputStream(conn.getOutputStream());
//getStrParams()为一个
dos.writeBytes( getStrParams(strParams).toString() );
dos.flush();
//文件上传
StringBuilder fileSb = new StringBuilder();
for (Map.Entry<String, File> fileEntry: fileParams.entrySet()){
fileSb.append(PREFIX)
.append(BOUNDARY)
.append(LINE_END)
/**
* 这里重点注意： name里面的值为服务端需要的key 只有这个key 才可以得到对应的文件
* filename是文件的名字，包含后缀名的 比如:abc.png
*/
.append("Content-Disposition: form-data; name=\"file\"; filename=\""
+ fileEntry.getKey() + "\"" + LINE_END)
.append("Content-Type: image/jpg" + LINE_END) //此处的ContentType不同于 请求头 中Content-Type
.append("Content-Transfer-Encoding: 8bit" + LINE_END)
.append(LINE_END);// 参数头设置完以后需要两个换行，然后才是参数内容
dos.writeBytes(fileSb.toString());
dos.flush();
InputStream is = new FileInputStream(fileEntry.getValue());
byte[] buffer = new byte[1024];
int len = 0;
while ((len = is.read(buffer)) != -1){
dos.write(buffer,0,len);
}
is.close();
dos.writeBytes(LINE_END);
}
//请求结束标志
dos.writeBytes(PREFIX + BOUNDARY + PREFIX + LINE_END);
dos.flush();
dos.close();
BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
StringBuilder response = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
response.append(line);
}
return response.toString();
} catch (Exception e) {
e.printStackTrace();
}finally {
if (conn!=null){
conn.disconnect();
}
}
return "";
}
/**
* 对post参数进行编码处理
* */
private static StringBuilder getStrParams(Map<String,Object> strParams){
StringBuilder strSb = new StringBuilder();
if(strParams != null && !strParams.isEmpty()){
for (Map.Entry<String, Object> entry : strParams.entrySet() ){
strSb.append(PREFIX)
.append(BOUNDARY)
.append(LINE_END)
.append("Content-Disposition: form-data; name=\"" + entry.getKey() + "\"" + LINE_END)
.append("Content-Type: text/plain; charset=" + CHARSET + LINE_END)
.append("Content-Transfer-Encoding: 8bit" + LINE_END)
.append(LINE_END)// 参数头设置完以后需要两个换行，然后才是参数内容
.append(entry.getValue())
.append(LINE_END);
}
}
return strSb;
}
}
