目的是为了不依赖第三方的jar包进行网络请求（如：commons-httpclient.jar）

1. 建立一个连接配置类
Java代码
  1. classUserAgentConfig{
  2. publicStringhost;
  3. publicStringscheme="http";
  4. publicintport=80;
  5. publicinttimeoutConnection=3000;
  6. publicinttimeoutSocket=20000;
  7. publicStringusername="";
  8. publicStringpassword="";
  9. }

2. 封装请求类
Java代码
  1. publicclassHttpRequest{
  3. /**
  4. *get"Stream"asresponse
  5. *
  6. *@paramurlrequestURL
  7. *@paramconfigconnectionconfig,canbenull
  8. *@paramparamsparameterforpostmethod,canbenull
  9. *@returnresponseinstream
  10. */
  11. publicstaticInputStreamgetStream(Stringurl,UserAgentConfigconfig,
  12. List<BasicNameValuePair>params){
  14. HttpEntityentity=httprequest(url,config,params);
  15. InputStreamret=null;
  17. if(entity!=null){
  18. try{
  19. byte[]b=EntityUtils.toByteArray(entity);
  20. ret=newByteArrayInputStream(b);
  21. }catch(Exceptione){
  22. e.printStackTrace();
  23. }finally{
  24. release(entity);
  25. }
  26. }
  28. returnret;
  29. }
  31. /**
  32. *get"String"asresponse
  33. *
  34. *@paramurlrequestURL
  35. *@paramconfigconnectionconfig,canbenull
  36. *@paramparamsparameterforpostmethod,canbenull
  37. *@returnresponseinstring
  38. */
  39. publicstaticStringgetString(Stringurl,UserAgentConfigconfig,
  40. List<BasicNameValuePair>params){
  42. HttpEntityentity=httprequest(url,config,params);
  43. Stringret=null;
  45. if(entity!=null){
  46. try{
  47. ret=EntityUtils.toString(entity);
  48. }catch(Exceptione){
  49. e.printStackTrace();
  50. }finally{
  51. release(entity);
  52. }
  53. }
  55. returnret;
  56. }
  58. privatestaticvoidrelease(HttpEntityentity){
  59. try{
  60. entity.consumeContent();
  61. }catch(IOExceptione){
  62. e.printStackTrace();
  63. }
  64. }
  66. /**
  67. *get"HttpEntity"asresponse
  68. *
  69. *@paramurlrequestURL
  70. *@paramconfigconnectionconfig,canbenull
  71. *@paramparamsparameterforpostmethod,canbenull
  72. *@return
  73. */
  74. privatestaticHttpEntityhttprequest(Stringurl,UserAgentConfigconfig,
  75. List<BasicNameValuePair>params){
  77. DefaultHttpClientclient=null;
  78. HttpEntityentity=null;
  80. try{
  82. BasicHttpParamshttpParameters=newBasicHttpParams();
  84. if(config!=null){
  85. //setconnectiontimeout
  86. HttpConnectionParams.setConnectionTimeout(httpParameters,
  87. config.timeoutConnection);
  88. HttpConnectionParams.setSoTimeout(httpParameters,
  89. config.timeoutSocket);
  90. }
  92. client=newDefaultHttpClient(httpParameters);
  94. DefaultHttpRequestRetryHandlerretryHandler=newDefaultHttpRequestRetryHandler(
  95. 3,true);
  97. client.setHttpRequestRetryHandler(retryHandler);
  99. //setusername&passwordifavailable
  100. if(config!=null
  101. &&!("".equals(config.username)&&""
  102. .equals(config.password))){
  103. AuthScopeas=newAuthScope(config.host,config.port);
  104. UsernamePasswordCredentialsupc=newUsernamePasswordCredentials(
  105. config.username,config.password);
  107. client.getCredentialsProvider().setCredentials(as,upc);
  108. }
  110. //checkgetorpostmethodbyparams
  111. HttpRequestBasemethod=null;
  112. if(params==null){
  113. method=newHttpGet(url);
  114. }else{
  115. method=newHttpPost(url);
  116. ((HttpPost)method).setEntity(newUrlEncodedFormEntity(params,
  117. "utf-8"));
  118. }
  119. method.setHeader("Content-Type","application/xml");
  121. //getresponse
  122. HttpResponseresponse=null;
  123. if(config==null){
  124. //onlyurlisavailable
  125. response=client.execute(method);
  126. }else{
  127. BasicHttpContextlocalContext=newBasicHttpContext();
  129. BasicSchemebasicAuth=newBasicScheme();
  130. localContext.setAttribute("preemptive-auth",basicAuth);
  132. HttpHosttargetHost=newHttpHost(config.host,config.port,
  133. config.scheme);
  135. response=client.execute(targetHost,method,localContext);
  136. }
  138. entity=response.getEntity();
  140. }catch(Exceptione){
  141. e.printStackTrace();
  142. }
  144. returnentity;
  145. }
  146. }

3. 调用
GET请求
Java代码
  1. Stringurl="...";
  2. test(url,null,null);

Java代码
  1. Stringurl="...";
  3. UserAgentConfigconfig=newUserAgentConfig();
  4. config.host="...";
  6. test(url,config,null);

POST请求
Java代码
  1. Stringurl="...";
  3. UserAgentConfigconfig=newUserAgentConfig();
  4. config.host="...";
  5. config.username="...";
  6. config.password="...";
  8. ArrayList<BasicNameValuePair>params=newArrayList<BasicNameValuePair>();
  9. params.add(newBasicNameValuePair("...","..."));
  10. ...
  12. test(url,config,params);

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