HttpConnectUtil实现文件的上传下载

package rest.test;
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.Iterator;
import java.util.Map;
import java.util.UUID;
import javax.activation.MimetypesFileTypeMap;
/**
* 网络访问工具类
* @author silk
*
*/
public class HttpClientUtil {
/**
* get方法直接调用post方法
* @param url 网络地址
* @return 返回网络数据
*/
public static String get(String url){
//return post(url,null);
HttpURLConnection conn=null;
try {
URL u = new URL(url);
conn = (HttpURLConnection)u.openConnection();
StringBuffer sb=null;
//获取连接状态码
int recode=conn.getResponseCode();
BufferedReader reader=null;
if(recode==200){
//Returns an input stream that reads from this open connection
//从连接中获取输入流
InputStream in=conn.getInputStream();
//对输入流进行封装
reader=new BufferedReader(new InputStreamReader(in,"UTF-8"));
String str=null;
sb=new StringBuffer();
//从输入流中读取数据
while((str=reader.readLine())!=null){
sb.append(str).append(System.getProperty("line.separator"));
}
//关闭输入流
reader.close();
if (sb.toString().length() == 0) {
return null;
}
return sb.toString().substring(0,
sb.toString().length() - System.getProperty("line.separator").length());
}
} catch (Exception e) {
e.printStackTrace();
return null;
}finally{
if(conn!=null)//关闭连接
conn.disconnect();
}
return null;
}
/**
* 设定post方法获取网络资源,如果参数为null,实际上设定为get方法
* @param url 网络地址
* @param param 请求参数键值对
* @return 返回读取数据
*/
public static  String post(String url,Map<String,Object> param){
HttpURLConnection conn=null;
try {
URL u=new URL(url);
conn=(HttpURLConnection) u.openConnection();
conn.setRequestProperty("accept", "*/*");
conn.setRequestProperty("connection", "Keep-Alive");
conn.setRequestProperty("Charset", "utf-8");
conn.setUseCaches(false);
//默认为false,post方法需要写入参数,设定true
//发送POST请求必须设置如下两行
conn.setDoOutput(true);
conn.setDoInput(true);
//设定post方法,默认get
conn.setRequestMethod("POST");
//conn.setConnectTimeout(10000);//连接超时 单位毫秒
//conn.setReadTimeout(2000);//读取超时 单位毫秒
StringBuffer sb=null;
if(param!=null){//如果请求参数不为空
sb=new StringBuffer();
//获得输出流
OutputStream out=conn.getOutputStream();
//对输出流封装成高级输出流  注意编码格式，防止中文乱码
BufferedWriter writer=new BufferedWriter(new OutputStreamWriter(out,"UTF-8"));
//将参数封装成键值对的形式  参数格式 xx=xx&yy=yy
for(Map.Entry<String,Object> entry : param.entrySet()){
sb.append(entry.getKey()).append("=").append(entry.getValue()).append("&");
}
//将参数通过输出流写入
writer.write(sb.deleteCharAt(sb.toString().length()-1).toString());
writer.flush();
writer.close();//一定要关闭,不然可能出现参数不全的错误
sb=null;
}
conn.connect();//建立连接
sb=new StringBuffer();
//获取连接状态码
int recode=conn.getResponseCode();
BufferedReader reader=null;
if(recode==200){
//从连接中获取输入流
InputStream in=conn.getInputStream();
//对输入流进行封装
reader=new BufferedReader(new InputStreamReader(in,"UTF-8"));
String str=null;
sb=new StringBuffer();
//从输入流中读取数据
while((str=reader.readLine())!=null){
sb.append(str);
}
//关闭输入流
in.close();
in = null;
reader.close();
//关闭连接
conn.disconnect();
if (sb.toString().length() == 0) {
return null;
}
return sb.toString();
}
} catch (Exception e) {
e.printStackTrace();
return null;
}finally{
if(conn!=null)//关闭连接
conn.disconnect();
}
return null;
}

/**
* 上传图片
*
* @param urlStr
* @param textMap
* @param fileMap
* @return
*/
public static String formUpload(String urlStr, Map<String, String> textMap,
Map<String, String> fileMap) {
String res = "";
HttpURLConnection conn = null;
String BOUNDARY = "-------------------"+UUID.randomUUID(); //boundary就是request头和上传文件内容的分隔符
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();
String contentType = new MimetypesFileTypeMap()
.getContentType(file);
if (filename.endsWith(".png")) {
contentType = "image/png";
}
if (contentType == null || contentType.equals("")) {
contentType = "application/octet-stream";
}

StringBuffer strBuf =
bbdf
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();

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) {
e.printStackTrace();
} finally {
if (conn != null) {
conn.disconnect();
conn = null;
}
}
return res;
}

/**
*
* @param urlPath
*            下载路径
* @param downloadDir
*            下载存放目录
* @return 返回下载文件
*/
@SuppressWarnings("finally")
public static File downloadFile(String urlPath, String downloadDir) {
File file = null;
try {
// 统一资源
URL url = new URL(urlPath);
URLConnection urlConnection = url.openConnection();
HttpURLConnection httpURLConnection = (HttpURLConnection) urlConnection;
// 设定请求的方法，默认是GET
httpURLConnection.setRequestMethod("POST");
// 设置字符编码
httpURLConnection.setRequestProperty("Charset", "UTF-8");
httpURLConnection.connect();
// 文件大小
int fileLength = httpURLConnection.getContentLength();
// 文件名
String filePathUrl = httpURLConnection.getURL().getFile();
String fileFullName = filePathUrl.substring(filePathUrl.lastIndexOf(File.separatorChar) + 1);

System.out.println("file length---->" + fileLength);

BufferedInputStream bin = new BufferedInputStream(httpURLConnection.getInputStream());

String path = downloadDir + File.separatorChar + fileFullName;
file = new File(path);
if (!file.getParentFile().exists()) {
file.getParentFile().mkdirs();
}
OutputStream out = new FileOutputStream(file);
int size = 0;
int len = 0;
byte[] buf = new byte[1024];
while ((size = bin.read(buf)) != -1) {
len += size;
out.write(buf, 0, size);
// 打印下载百分比
// System.out.println("下载了-------> " + len * 100 / fileLength +
// "%\n");
}
bin.close();
out.close();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
return file;
}

}

/**
* 测试
* @param args
*/
public static void main(String[] args) {
//System.out.println(HttpClientUtil.get("http://www.baidu.com"));
downloadFile("http://img1.gtimg.com/news/pics/hv1/171/124/2203/143281866.jpg", "D:\\");

}
}