java http请求(一) ---- 工具
? 2?import?java.io.ByteArrayOutputStream;
??3?import?java.io.DataOutputStream;
??4?import?java.io.InputStream;
??5?import?java.net.HttpURLConnection;
??6?import?java.net.URL;
??7?import?java.net.URLEncoder;
??8?import?java.util.Map;
??9?import?android.util.Log;
?10?
?11?public?class?NetUtil?{
?12?
?13?????private?static?final?String?TAG?=?"NetUtil";
?14?????private?static?final?int?RESPONSE_OK?=?200;
?15?????
?16?????public?static?InputStream?sendPostRequest(String?urlPath,
?17?????????????Map<String,?String>?params,?String?encoding)?throws?Exception?{
?18?????????//?String?param?=?"method=save&id=24&name="
?19?????????//?+?URLEncoder.encode("大圆",?"UTF-8");
?20?????????StringBuilder?sb?=?new?StringBuilder();
?21?????????for?(Map.Entry<String,?String>?entry?:?params.entrySet())?{
?22?????????????sb.append(entry.getKey()).append("=")
?23?????????????????????.append(URLEncoder.encode(entry.getValue(),?encoding))
?24?????????????????????.append("&");
?25?????????}
?26?????????sb.deleteCharAt(sb.lastIndexOf("&"));
?27?????????byte[]?data?=?sb.toString().getBytes();
?28?????????URL?url?=?new?URL(urlPath);
?29?????????HttpURLConnection?conn?=?(HttpURLConnection)?url.openConnection();
?30?????????conn.setRequestMethod("POST");
?31?????????conn.setReadTimeout(5?*?1000);
?32?????????conn.setDoOutput(true);?//?发送POST请求，?必须设置允许输出
?33?????????conn.setUseCaches(false);
?34?????????conn.setRequestProperty("Connection",?"Keep-Alive");?//?维持长链接
?35?????????conn.setRequestProperty("Charset",?"UTF-8");
?36?????????//?设置输入参数的大小，把参数转化为字节数组
?37?????????conn.setRequestProperty("Content-Length",?String.valueOf(data.length));
?38?????????//?设置数据类型
?39?????????conn.setRequestProperty("Content-Type",
?40?????????????????"application/x-www-form-urlencoded");
?41?????????
?42?????????DataOutputStream?outStream?=?new?DataOutputStream(
?43?????????????????conn.getOutputStream());
?44?????????outStream.write(data);
?45?????????outStream.flush();
?46?????????outStream.close();
?47?????????if?(conn.getResponseCode()?==?RESPONSE_OK)?{
?48?????????????return?conn.getInputStream();
?49?????????}
?50?????????return?null;
?51?????}
?52?
?53?????/*
?54??????*?得到http返回的输入流，并且转化成String
?55??????*/
?56?????public?static?String?getTextContent(String?urlPath,?String?encoding)
?57?????????????throws?Exception?{
?58?????????URL?url?=?new?URL(urlPath);
?59?????????HttpURLConnection?conn?=?(HttpURLConnection)?url.openConnection();
?60?????????conn.setRequestMethod("GET");
?61?????????conn.setReadTimeout(5?*?1000);
?62?????????if?(conn.getResponseCode()?==?RESPONSE_OK)?{
?63?????????????InputStream?inStream?=?conn.getInputStream();
?64?????????????byte[]?data?=?readStream(inStream);
?65?????????????System.out.println(new?String(data,?encoding));
?66?????????????return?new?String(data,?encoding);
?67?????????}
?68?????????return?null;
?69?????}
?70?
?71?????//?读取数据
?72?????public?static?byte[]?readStream(InputStream?inStream)?throws?Exception?{
?73?????????ByteArrayOutputStream?outStream?=?new?ByteArrayOutputStream();
?74?????????byte[]?buffer?=?new?byte[2048];
?75?????????int?length?=?-1;
?76?????????while?((length?=?(inStream.read(buffer)))?!=?-1)?{
?77?????????????outStream.write(buffer,?0,?length);
?78?????????}
?79?????????outStream.close();
?80?????????return?outStream.toByteArray();
?81?????}
?82?
?83?????//?直接返回http得到的输入流
?84?????public?static?InputStream?getStreamContent(String?urlPath,?String?encoding)
?85?????????????throws?Exception?{
?86?????????InputStream?inStream?=?null;
?87?????????URL?url?=?new?URL(urlPath);
?88?????????HttpURLConnection?conn?=?(HttpURLConnection)?url.openConnection();
?89?????????conn.setRequestMethod("GET");
?90?????????conn.setReadTimeout(5?*?1000);
?91?????????if?(conn.getResponseCode()?==?RESPONSE_OK)?{
?92?????????????inStream?=?conn.getInputStream();
?93?????????}
?94?????????return?inStream;
?95?????}
?96?
?97?????public?static?void?print(String?tag,?String?msg)?{
?98?????????Log.d(tag,?msg);
?99?????}
100?}
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