从输入流中获取数据并以字节数组返回

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从输入流中获取数据并以字节数组返回

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
public class StreamTool {
/**
* 从输入流获取数据
* @param inputStream
* @return
* @throws Exception
*/
public static byte[] readInputStream(InputStream inputStream) throws Exception {
byte[] buffer = new byte[1024]; //你可以根据实际需要调整缓存大小
int len = -1;
ByteArrayOutputStream outSteam = new ByteArrayOutputStream();
//以前我在学IO流时不写下句buffer,结果操作文件中无任何内容
while( (len = inputStream.read(buffer)) != -1 ){
outSteam.write(buffer, 0, len);
}
outSteam.close();
inputStream.close();
return outSteam.toByteArray();
}
}
通过Android客户端上传数据到服务器：可以上传简单的表单，也可以方便的上传带有附件的文件，此类远远比Android自身的HttpClient更高效、更易于使用
import java.io.DataOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
public class HttpRequester {
/**
* 直接通过HTTP协议提交数据到服务器,实现如下面表单提交功能:
*
* @param actionUrl 上传路径(注：避免使用localhost或127.0.0.1这样的路径测试，因为它会指向手机模拟器，http://192.168.1.10:8080这样的路径测试)
* @param params 请求参数 key为参数名,value为参数值
* @param file 上传文件
*/
public static String post(String actionUrl, Map params, FormFile[] files) {
try {
String BOUNDARY = "---------7d4a6d158c9"; //数据分隔线
String MULTIPART_FORM_DATA = "multipart/form-data";
URL url = new URL(actionUrl);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setConnectTimeout(5* 1000);
conn.setDoInput(true);//允许输入
conn.setDoOutput(true);//允许输出
conn.setUseCaches(false);//不使用Cache
conn.setRequestMethod("POST");
conn.setRequestProperty("Connection", "Keep-Alive");
conn.setRequestProperty("Charset", "UTF-8");
conn.setRequestProperty("Content-Type", MULTIPART_FORM_DATA + ";
boundary=" + BOUNDARY);
StringBuilder sb = new StringBuilder();
for (Map.Entry entry : params.entrySet()) { //构建表单字段内容
sb.append("--");
sb.append(BOUNDARY);
sb.append(" ");
sb.append("Content-Disposition: form-data; name=""+ entry.getKey() + "" ");
sb.append(entry.getValue());
sb.append(" ");
}
DataOutputStream outStream = new DataOutputStream(conn.getOutputStream());
outStream.write(sb.toString().getBytes());//发送表单字段数据
for(FormFile file : files){ //发送文件数据
StringBuilder split = new StringBuilder();
split.append("--");
split.append(BOUNDARY);
split.append(" ");
split.append("Content-Disposition: form-data;name=""+
file.getFormname()+"";filename=""+ file.getFilname() + "" ");
split.append("Content-Type: "+ file.getContentType()+" ");
outStream.write(split.toString().getBytes());
if(file.getInStream()!=null){
byte[] buffer = new byte[1024];
int len = 0;
while((len = file.getInStream().read(buffer))!=-1){
outStream.write(buffer, 0, len);
}
file.getInStream().close();
}else{
outStream.write(file.getData(), 0, file.getData().length);
}
outStream.write(" ".getBytes());
}
byte[] end_data = ("--" + BOUNDARY + "-- ").getBytes();//数据结束标志
outStream.write(end_data);
outStream.flush();
int cah = conn.getResponseCode();
if (cah != 200) throw new RuntimeException("请求url失败");
InputStream is = conn.getInputStream();
int ch;
StringBuilder b = new StringBuilder();
while( (ch = is.read()) != -1 ){
b.append((char)ch);
}
outStream.close();
conn.disconnect();
return b.toString();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
/**
* 提交数据到服务器
* @param actionUrl 上传路径(注：避免使用localhost或127.0.0.1这样的路径测试，因为它会指向手机模拟器，你可以使用http://www.cnblogs.com/guoshiandroid或http://192.168.1.10:8080这样的路径测试)
* @param params 请求参数 key为参数名,value为参数值
* @param file 上传文件
*/
public static String post(String actionUrl, Map params, FormFile file) {
return post(actionUrl, params, new FormFile[]{file});
}
public static byte[] postFromHttpClient(String path, Map params, String encode) throws Exception{
List formparams = new ArrayList();//用于存放请求参数
for(Map.Entry entry : params.entrySet()){
formparams.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
}
UrlEncodedFormEntity entity = new UrlEncodedFormEntity(formparams, "UTF-8");
HttpPost httppost = new HttpPost(path);
httppost.setEntity(entity);
HttpClient httpclient = new DefaultHttpClient();//看作是浏览器
HttpResponse response = httpclient.execute(httppost);//发送post请求
return StreamTool.readInputStream(response.getEntity().getContent());
}
/**
* 发送请求
* @param path 请求路径
* @param params 请求参数 key为参数名称 value为参数值
* @param encode 请求参数的编码
*/
public static byte[] post(String path, Map params, String encode) throws Exception{
//String params = "method=save&name="+ URLEncoder.encode("国士工作室", "UTF-8")+ "&age=28&";//需要发送的参数
StringBuilder parambuilder = new StringBuilder("");
if(params!=null && !params.isEmpty()){
for(Map.Entry entry : params.entrySet()){
parambuilder.append(entry.getKey()).append("=")
.append(URLEncoder.encode(entry.getValue(), encode)).append("&");
}
parambuilder.deleteCharAt(parambuilder.length()-1);
}
byte[] data = parambuilder.toString().getBytes();
URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection)url.openConnection();
conn.setDoOutput(true);//允许对外发送请求参数
conn.setUseCaches(false);//不进行缓存
conn.setConnectTimeout(5 * 1000);
conn.setRequestMethod("POST");
//下面设置http请求头
conn.setRequestProperty("Accept", "p_w_picpath/gif, p_w_picpath/jpeg, p_w_picpath/pjpeg, p_w_picpath/pjpeg, application/x-shockwave-flash, application/xaml+xml, application/vnd.ms-xpsdocument, application/x-ms-xbap, application/x-ms-application, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*");
conn.setRequestProperty("Accept-Language", "zh-CN");
conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.2; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)");
conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
conn.setRequestProperty("Content-Length", String.valueOf(data.length));
conn.setRequestProperty("Connection", "Keep-Alive");
//发送参数
DataOutputStream outStream = new DataOutputStream(conn.getOutputStream());
outStream.write(data);//把参数发送出去
outStream.flush();
outStream.close();
if(conn.getResponseCode()==200){
return StreamTool.readInputStream(conn.getInputStream());
}
return null;
}
}

转载于:https://blog.51cto.com/mzh3344258/687233

从输入流中获取数据并以字节数组返回

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