package com.smartdoer.utils;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.SocketTimeoutException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.springframework.web.multipart.MultipartFile;
public class HttpPostUtil {
URL url;
HttpURLConnection conn;
String boundary = "--------";
Map<String, String> textParams = new HashMap<String, String>();
List<MultipartFile> fileparams = new ArrayList<MultipartFile>();
List<File> fileList = new ArrayList<File>();
List<String> urlList = new ArrayList<String>();
DataOutputStream ds;
public HttpPostUtil(String url) throws Exception {
this.url = new URL(url);
}
//重新设置要请求的服务器地址，即上传文件的地址。
public void setUrl(String url) throws Exception {
this.url = new URL(url);
}
//增加一个普通字符串数据到form表单数据中
public void addTextParameter(String name, String value) {
textParams.put(name, value);
}
//增加一个文件到form表单数据中
public void addFileParameter(MultipartFile value) {
fileparams.add(value);
}
//增加一个file类型的文件到form表单中
public void addFileList(File value){
fileList.add(value);
}
public void addUrlList(String str){
urlList.add(str);
}
// 清空所有已添加的form表单数据
public void clearAllParameters() {
textParams.clear();
fileparams.clear();
}
// 发送数据到服务器，返回一个字节包含服务器的返回结果的数组
public String send() throws Exception {
StringBuffer result = new StringBuffer();
initConnection();
try {
conn.connect();
} catch (SocketTimeoutException e) {
// something
throw new RuntimeException();
}
ds = new DataOutputStream(conn.getOutputStream());
writeFileParams();
writeStringParams();
writeFileList();
writeUrlList();
paramsEnd();
BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream(),
"utf-8"));
String line = "";
while ((line = in.readLine()) != null) {
result.append(line).append("\n");
}
conn.disconnect();
return result.toString();
}
//文件上传的connection的一些必须设置
private void initConnection() throws Exception {
conn = (HttpURLConnection) this.url.openConnection();
conn.setDoOutput(true);
conn.setUseCaches(false);
conn.setConnectTimeout(10000); //连接超时为10秒
conn.setRequestMethod("POST");
conn.setRequestProperty("Charsert", "UTF-8");
conn.setRequestProperty("Accept-Charset", "utf-8");
conn.setRequestProperty("contentType", "utf-8");
conn.setRequestProperty("Content-Type", "text/plain; charset=utf-8");
conn.setRequestProperty("Content-Type",
"multipart/form-data; boundary=" + boundary);
}
//普通字符串数据
private void writeStringParams() throws Exception {
Set<String> keySet = textParams.keySet();
for (Iterator<String> it = keySet.iterator(); it.hasNext();) {
String name = it.next();
String value = textParams.get(name);
ds.writeBytes("--" + boundary + "\r\n");
ds.writeBytes("Content-Disposition: form-data; name=\"" + name + "\"\r\n");
ds.writeBytes("\r\n");
ds.writeBytes(encode(value) + "\r\n");
}
}
//文件数据
private void writeFileParams() throws Exception {
String name = "upload";
for (MultipartFile file : fileparams) {
MultipartFile value = file;
ds.writeBytes("--" + boundary + "\r\n");
ds.writeBytes("Content-Disposition: form-data; name=\"" + name
+ "\"; filename=\"" + encode(value.getOriginalFilename()) + "\"\r\n");
ds.writeBytes("Content-Type: " + getContentType(value) + "\r\n");
ds.writeBytes("\r\n");
ds.write(getBytes(value));
ds.writeBytes("\r\n");
}
}
//文件数据 (file)
private void writeFileList() throws Exception {
String name = "upload";
for (File file : fileList) {
File value = file;
ds.writeBytes("--" + boundary + "\r\n");
ds.writeBytes("Content-Disposition: form-data; name=\"" + name
+ "\"; filename=\"" + encode(value.getName()) + "\"\r\n");
ds.writeBytes("Content-Type: image \r\n");
ds.writeBytes("\r\n");
ds.write(getBytes(value));
ds.writeBytes("\r\n");
}
}
//文件数据 (url)
private void writeUrlList() throws Exception {
String name = "upload";
for (String strUrl : urlList) {
URL url = new URL(strUrl);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
DataInputStream input = new DataInputStream(conn.getInputStream());
DataOutputStream output = new DataOutputStream(new FileOutputStream(strUrl.substring(strUrl.lastIndexOf("/") + 1).toUpperCase()));
byte[] buffer = new byte[1024 * 8 * 1000];
int count = 0;
count = input.read(buffer);
// while ((count = input.read(buffer)) > 0) {
// output.write(buffer, 0, count);
// }
ds.writeBytes("--" + boundary + "\r\n");
ds.writeBytes("Content-Disposition: form-data; name=\"" + name
+ "\"; filename=\"" + encode(strUrl) + "\"\r\n");
ds.writeBytes("Content-Type: image \r\n");
ds.writeBytes("\r\n");
ds.write(buffer);
ds.writeBytes("\r\n");
output.close();
input.close();
}
}
//获取文件的上传类型，图片格式为image/png,image/jpg等。非图片为application/octet-stream
private String getContentType(MultipartFile f) throws Exception {
// return "application/octet-stream"; // 此行不再细分是否为图片，全部作为application/octet-stream 类型
// ImageInputStream imagein = ImageIO.createImageInputStream(f);
// if (imagein == null) {
// return "application/octet-stream";
// }
// Iterator<ImageReader> it = ImageIO.getImageReaders(imagein);
// if (!it.hasNext()) {
// imagein.close();
// return "application/octet-stream";
// }
// imagein.close();
// return "image/" + it.next().getFormatName().toLowerCase();//将FormatName返回的值转换成小写，默认为大写
return "image";
}
//把文件转换成字节数组
private byte[] getBytes(MultipartFile f) throws Exception {
InputStream is = f.getInputStream();
// FileInputStream in = (FileInputStream)f.getInputStream(); 修改，因图片太小，上传报错，直接使用inputstream即可。
ByteArrayOutputStream out = new ByteArrayOutputStream();
byte[] b = new byte[1024];
int n;
while ((n = is.read(b)) != -1) {
out.write(b, 0, n);
}
is.close();
// in.close();
return out.toByteArray();
}
//把文件转换成字节数组
private byte[] getBytes(File f) throws Exception {
FileInputStream in = new FileInputStream(f);
ByteArrayOutputStream out = new ByteArrayOutputStream();
byte[] b = new byte[1024];
int n;
while ((n = in.read(b)) != -1) {
out.write(b, 0, n);
}
in.close();
return out.toByteArray();
}
//添加结尾数据
private void paramsEnd() throws Exception {
ds.writeBytes("--" + boundary + "--" + "\r\n");
ds.writeBytes("\r\n");
}
// 对包含中文的字符串进行转码，此为UTF-8。服务器那边要进行一次解码
private String encode(String value) throws Exception{
return URLEncoder.encode(value, "UTF-8");
}
public static void main(String[] args) throws Exception {
String postData = "{\"id\":\"212\",\"title\":\"测试1\",\"content\":\"测试1\",\"author\":\"测试1\",\"createtime\":\"2016-3-4 15:25:16\"}";
String postUrl="http://localhost:81/qmcg/admin/interData/webSiteCase/outSideDataImp";
HttpPostUtil u = new HttpPostUtil(postUrl);
// u.addFileParameter(new MultipartFile("d:/pvm.jpg"));
// u.addFileParameter(new MultipartFile("d:/cb6c15f6-a187-3026-8911-03eec0a95cc2.png"));
// u.addTextParameter("gson", postData);
u.addUrlList("http://127.0.0.1:81/pirImg/upload/Image/201608/20160826152343638.png");
String result = u.send();
System.out.println("result:"+result);
}
}
开始时，上传图片正常，后来无意间发现有一些图片上传失败，报的错误为ByteArrayInputStream不能转化成FileInputStream，
后来发现，是因为图片太小的事，大图片没有问题，经过修改后是这样 
图片中红框内注释的为以前的代码。