Android Studio 亲感受之无法访问URL

访问URL的方法代码如下：

package SuComs.http;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;

public class corequest {
    public static SuComs.result.coresult Get(String _url)
    {
        return Get(_url, new SuComs.para.coparas());
    }

    public static SuComs.result.coresult Get(String _url, SuComs.para.coparas _paras)
    {
        SuComs.result.coresult __temp = new SuComs.result.coresult();

        String __paras = "paras=" + _paras.UrlEncode();

        PrintWriter out = null;
        BufferedReader in = null;
        try {
            URL realUrl = new URL(_url);
            //打开和URL之间的连接  
            URLConnection conn = realUrl.openConnection();
            //设置通用的请求属性  
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)");
            //发送POST请求必须设置如下两行  
            conn.setDoOutput(true);
            conn.setDoInput(true);
            //获取URLConnection对象对应的输出流  
            out = new PrintWriter(conn.getOutputStream());
            //发送请求参数  
            out.print(__paras);
            //flush输出流的缓冲  
            out.flush();
            //定义BufferedReader输入流来读取URL的响应  
            in = new BufferedReader(
                    new InputStreamReader(conn.getInputStream()));
            String line;
            String str = "";
            while ((line = in .readLine()) != null) {
                str += line;
            }
            __temp = new SuComs.result.coresult();
            __temp.Data(str);
        } catch (Exception e) {
            __temp.Success(false);
            __temp.Error("发送POST请求出现异常！" + e);
            e.printStackTrace();
        }
        //使用finally块来关闭输出流、输入流  
        finally {
            try {
                if (out != null) {
                    out.close();
                }
                if ( in != null) { in .close();
                }
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
        return __temp;
    }

}

在Android Studio调试时，发现在 out = new PrintWriter(conn.getOutputStream());处报错，错误提示java.io.eofexception

后查找资料，该方法需要放在线程中执行，在这里搁到了Task中执行