try {
                //这个URL是对外开放的,用于合作伙伴连接请求.
            URL url = new URL("http://www.baidu.com");
            
            HttpURLConnection g_URLConnection = (HttpURLConnection) url.openConnection();
            g_URLConnection.setRequestProperty("content-type", "text/html;charset=utf-8");  
            g_URLConnection.setDoOutput(true);
            g_URLConnection.setDoInput(true);
            
            //打开文件,该文件是请求报文.
            FileInputStream fis = new FileInputStream("D:/请求报文.xml");
            String byteTemp = fis.toString();
            
            //生成输出流对象
            OutputStream v_OutputStream = g_URLConnection.getOutputStream();
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            
            //写入文件内容
            int x = 0;
            while((x = fis.read()) != -1){
              bos.write(x);
            }
            fis.close();

            System.out.println("加密前发送报文 ：");
            System.out.println(new String(bos.toByteArray()));
            
            // DESPlus是加密解密类
            DESPlus desPlus = new DESPlus();
            String s = new String(bos.toByteArray());
            s = desPlus.encrypt(s);
            byte[] bytes = s.getBytes();
            System.out.println("加密后发送报文 ：");
            System.out.println(s);
            
            v_OutputStream.write(bytes);
            //刷新输出流
            v_OutputStream.flush();
            int code = g_URLConnection.getResponseCode();
             System.out.println("code   " + code);        


            //获得服务器相应的输入流
            InputStream g_return = g_URLConnection.getInputStream();
            ByteArrayOutputStream bos2 = new ByteArrayOutputStream();
            while ((x = g_return.read()) != -1) {
                bos2.write(x);
            }
            bos2.flush();

            //关闭URL
            v_OutputStream.close();
            g_return.close();
            System.out.println("解密前返回报文：");
            String str = new String(bos2.toByteArray());
            System.out.println(str);
            str = desPlus.decrypt(str);
            System.out.println("解密后返回报文：");
            
            System.out.println(AbstractMarshaller.formatXML(str));

        } catch (Exception e) {
            System.out.println(e.getMessage());
        }
 
下面的是DESPlus类中的代码
代码
package com.siebre.util;

import java.security.Key;
import java.security.Security;

import javax.crypto.Cipher;

/**
 * 
 * @author Administrator DES加密解密
 */
public class DESPlus {
    private static String strDefaultKey = "aaaa"; // 默认密钥
    private Cipher encryptCipher = null;
    private Cipher decryptCipher = null;

    /*
     * @param arrB 需要转换的byte数组 
     * @return 转换后的字符串 
     * @throws Exception
     * 本方法不处理任何异常，所有异常全部抛出
     */
    public static String byteArr2HexStr(byte[] arrB) throws Exception {
        int iLen = arrB.length;
        // 每个byte用两个字符才能表示，所以字符串的长度是数组长度的两倍
        StringBuffer sb = new StringBuffer(iLen * 2);
        for (int i = 0; i < iLen; i++) {
            int intTmp = arrB[i];
            // 把负数转换为正数
            while (intTmp < 0) {
                intTmp = intTmp + 256;
            }
            // 小于0F的数需要在前面补0
            if (intTmp < 16) {
                sb.append("0");
            }
            sb.append(Integer.toString(intTmp, 16));
        }
        return sb.toString();
    }

    /*
     * @param strIn 需要转换的字符串 
     * @return 转换后的byte数组 
     * @throws Exception
     * 本方法不处理任何异常，所有异常全部抛出
     * 
     */
    public static byte[] hexStr2ByteArr(String strIn) throws Exception {
        byte[] arrB = strIn.getBytes();
        int iLen = arrB.length;

        // 两个字符表示一个字节，所以字节数组长度是字符串长度除以2
        byte[] arrOut = new byte[iLen / 2];
        for (int i = 0; i < iLen; i = i + 2) {
            String strTmp = new String(arrB, i, 2);
            arrOut[i / 2] = (byte) Integer.parseInt(strTmp, 16);
        }
        return arrOut;
    }

    /**
     * 默认构造方法，使用默认密钥
     * 
     * @throws Exception
     */
    public DESPlus() throws Exception {
        Security.addProvider(new com.sun.crypto.provider.SunJCE());
        Key key = getKey(strDefaultKey.getBytes());

        encryptCipher = Cipher.getInstance("DES");
        encryptCipher.init(Cipher.ENCRYPT_MODE, key);

        decryptCipher = Cipher.getInstance("DES");
        decryptCipher.init(Cipher.DECRYPT_MODE, key);
    }

    /**
     * 加密字节数组
     * 
     * @param arrB
     *            需加密的字节数组
     * @return 加密后的字节数组
     * @throws Exception
     */
    public byte[] encrypt(byte[] arrB) throws Exception {
        return encryptCipher.doFinal(arrB);
    }

    /**
     * 加密字符串
     * 
     * @param strIn
     *            需加密的字符串
     * @return 加密后的字符串
     * @throws Exception
     */
    public String encrypt(String strIn) throws Exception {
        return byteArr2HexStr(encrypt(strIn.getBytes()));
    }

    /**
     * 解密字节数组
     * 
     * @param arrB
     *            需解密的字节数组
     * @return 解密后的字节数组
     * @throws Exception
     */
    public byte[] decrypt(byte[] arrB) throws Exception {
        return decryptCipher.doFinal(arrB);
    }

    /**
     * 解密字符串
     * 
     * @param strIn
     *            需解密的字符串
     * @return 解密后的字符串
     * @throws Exception
     */
    public String decrypt(String strIn) throws Exception {
        return new String(decrypt(hexStr2ByteArr(strIn)));
    }

    /**
     * 从指定字符串生成密钥，密钥所需的字节数组长度为8位 不足8位时后面补0，超出8位只取前8位
     * 
     * @param arrBTmp
     *            构成该字符串的字节数组
     * @return 生成的密钥
     * @throws java.lang.Exception
     */
    private Key getKey(byte[] arrBTmp) throws Exception {
        // 创建一个空的8位字节数组（默认值为0）
        byte[] arrB = new byte[8];

        // 将原始字节数组转换为8位
        for (int i = 0; i < arrBTmp.length && i < arrB.length; i++) {
            arrB[i] = arrBTmp[i];
        }

        // 生成密钥
        Key key = new javax.crypto.spec.SecretKeySpec(arrB, "DES");

        return key;
    }
}


 

请大家帮忙转换一下，谢谢