java模拟表单上传文件，java通过模拟post方式提交表单实现图片上传功能实例
HttpClient 测试类，提供get post方法实例
package com.zdz.httpclient; 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
* @author zdz8207
* {@link http://www.cnblogs.com/zdz8207/}
* @version 1.0
*/
public class HttpUploadFile { public static void main(String[] args) {
testUploadImage();
} /**
* 测试上传png图片
*
*/
public static void testUploadImage(){
String url = "http://xxx/wnwapi/index.php/Api/Index/testUploadModelBaking";
String fileName = "e:/chenjichao/textures/antimap_0017.png";
Map<String, String> textMap = new HashMap<String, String>();
//可以设置多个input的name，value
textMap.put("name", "testname");
textMap.put("type", "2");
//设置file的name，路径
Map<String, String> fileMap = new HashMap<String, String>();
fileMap.put("upfile", fileName);
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("\r\n").append("--").append(BOUNDARY)
.append("\r\n");
strBuf.append("Content-Disposition: form-data; name=\""
+ inputName + "\"\r\n\r\n");
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("\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.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 = ("\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(
conn.getInputStream()));
String line = null;
while ((line = reader.readLine()) != null) {
strBuf.append(line).append("\n");
}
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;
}
}
HttpClientTest.java
package com.zdz.httpclient;import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.NameValuePair;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.methods.PostMethod;/**
* HttpClient 测试类，提供get post方法实例
* @author zdz8207
*
*/
public class HttpClientTest {
private static final String URL = "http://www.163.com";
private static final int PORT = 80; public static void main(String[] args) throws Exception {
//测试get方法
doGetMethod(URL,PORT);
//测试post方法
String posturl = "http://mail.163.com/";
doPostMethod(posturl,PORT);
} /**
* http get 方法
* @param url
* @param port
* @throws HttpException
* @throws IOException
* @return bodystring
*/
public static String doGetMethod(String url,int port) throws HttpException, IOException {
HttpClient client = new HttpClient();
// 设置代理服务器地址和端口
client.getHostConfiguration().setHost(url, port);
// 使用 GET 方法
GetMethod method = new GetMethod(url);
//执行请求
client.executeMethod(method); // 打印服务器返回的状态
System.out.println(method.getStatusLine());
// 打印返回的信息
// System.out.println(method.getResponseBodyAsString());
// response body of large or unknown size. Using getResponseBodyAsStream instead is recommended.
InputStream bodystreams = method.getResponseBodyAsStream();
String body = convertStreamToString(bodystreams);
System.out.println(body);
// 释放连接
method.releaseConnection(); return body;
} /**
* http post 方法
* @param url
* @param port
* @throws HttpException
* @throws IOException
* @return bodystring
*/
public static String doPostMethod(String url,int port) throws HttpException, IOException {
HttpClient client = new HttpClient();
// 设置代理服务器地址和端口
client.getHostConfiguration().setHost(url, port);
// 使用POST方法
PostMethod method = new PostMethod(url);
//设置传递参数
NameValuePair agent = new NameValuePair("User-Agent","Mozilla/4.0 (compatible; MSIE 8.0; Windows 2000)");
NameValuePair username = new NameValuePair("email", "xxx@163.com");
NameValuePair password = new NameValuePair("password", "xxxxxx");
method.setRequestBody(new NameValuePair[] { agent, username, password });
//执行请求
client.executeMethod(method);
// 设置cookies
// Cookie[] cookies = client.getState().getCookies();
// client.getState().addCookies(cookies); // 打印服务器返回的状态
System.out.println(method.getStatusLine());
// 打印返回的信息
// System.out.println(method.getResponseBodyAsString());
// response body of large or unknown size. Using getResponseBodyAsStream instead is recommended.
InputStream bodystreams = method.getResponseBodyAsStream();
String body = convertStreamToString(bodystreams);
System.out.println(body);
// 释放连接
method.releaseConnection(); return body;
} /**
* 把InputStream 转换成String返回
* @param is InputStream
* @return String
* @throws UnsupportedEncodingException
*/
public static String convertStreamToString(InputStream is) throws UnsupportedEncodingException {
// BufferedReader reader = new BufferedReader(new InputStreamReader(is));//输出的中文乱码
BufferedReader reader = new BufferedReader(new InputStreamReader(is,"utf8")); //GBK
StringBuilder sb = new StringBuilder();
String line = null;
try {
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return sb.toString();
}}
项目实例下载地址（包括对应jar包）
ps:New text file line delimiter选择不同导致控制台输出编码不同,如下图所示：
