Android使用OkHttp进行重定向拦截处理的方法

final OkHttpClient client = new OkHttpClient().newBuilder()
        .followRedirects(false) //禁制OkHttp的重定向操作，我们自己处理重定向
        .followSslRedirects(false)
        .COOKIEJar(new LocalCOOKIEJar())  //为OkHttp设置自动携带COOKIE的功能
        .build();

//COOKIEJar是用于保存COOKIE的
class LocalCOOKIEJar implements COOKIEJar{
  List COOKIEs;
  @Override
  public List loadForRequest(HttpUrl arg0) {
     if (COOKIEs != null)
        return COOKIEs;
      return new ArrayList();
  }

  @Override
  public void saveFromResponse(HttpUrl arg0, List COOKIEs) {
    this.COOKIEs = COOKIEs;
  }
  
}

/**
  * Populates request with defaults and COOKIEs.
  *
  * 
This client doesn't specify a default {@code Accept} header because it doesn't know what
  * content types the application is interested in.
  */
 private Request networkRequest(Request request) throws IOException {
  Request.Builder result = request.newBuilder();

  //如果COOKIEJar的COOKIE不为空，则设置COOKIE字段
  List COOKIEs = client.COOKIEJar().loadForRequest(request.url());
  if (!COOKIEs.isEmpty()) {
   result.header("COOKIE", COOKIEHeader(COOKIEs));
  }

  return result.build();
 }

    final OkHttpClient client = new OkHttpClient().newBuilder()
        .followRedirects(false)
        .followSslRedirects(false)
        .COOKIEJar(new LocalCOOKIEJar())
        .build();
    //构造一个POST请求
    RequestBody body = new FormBody.Builder().add("UserStyle", "student")
        .add("user", "xxx").add("password", "xxx").build();
        
    Request request = new Request.Builder().url("http://222.195.8.201/pass.asp").post(body).build();
    
    client.newCall(request).enqueue(new Callback() {
      
      @Override
      public void onResponse(Call call, Response response) throws IOException {
        /**
         * 如果不用COOKIEJar,那么就要自己去解析返回的Set-COOKIE字段,解析之后通过addHeader("COOKIE", COOKIE)
         * 添加COOKIE请求头
         */
//       List COOKIEs = response.headers("Set-COOKIE");
//       String COOKIE = "";
//       for(int i=COOKIEs.size()-1; i>=0; i--){
//         COOKIE = COOKIE+ COOKIEs.get(i).replace("path=/", "") + " ";
//       }
        
        //做GET请求
        Request redirectRequest = new Request.Builder().url("http://222.195.8.201/student/asp/Select_Success.asp")
//          .addHeader("COOKIE", COOKIE)
           .build();
        //拿到登陆后操作的某个网页的内容
        Response response2 = client.newCall(redirectRequest).execute();
        String result = response2.body().string();
        System.out.println(result);
      }
      
      @Override
      public void onFailure(Call arg0, IOException arg1) {
        
      }
    });