java web返回中文乱码问题及解决

produces = {“text/html;charset=utf-8”}

if(StrCharset.getEncoding(str).equals(StrCharset.ISO_8859_1))
					stream.write(str.getBytes(StrCharset.ISO_8859_1));
				else if(StrCharset.getEncoding(str).equals(StrCharset.UTF_8))
				{
					try{
					byte[] b=str.getBytes(StrCharset.GBK);
					stream.write(b,1,b.length-1);
					//stream.write(new String(str.getBytes("GBK"),"GBK").getBytes());
					}catch(Exception e)
					{
						stream.write(str.getBytes(StrCharset.GBK));
					}
				}
				else
					stream.write(str.getBytes(StrCharset.GBK));

import java.nio.charset.Charset;
public class Encoding
{
    public static String getEncoding(String str) 
    {    
        String encode;
	encode = "UTF-16";   		
        try 
	{    
            if(str.equals(new String(str.getBytes(), encode))) 
	    {   
                return encode;    
            }    
        } 
	catch(Exception ex) {} 
	encode = "ASCII";    
        try 
	{    
            if(str.equals(new String(str.getBytes(), encode)))
	    {    
                return "字符串<< " + str + " >>中仅由数字和英文字母组成，无法识别其编码格式";    
            }    
        } 
	catch(Exception ex) {}    
	encode = "ISO-8859-1";    
        try 
	{    
            if(str.equals(new String(str.getBytes(), encode))) 
	    {    
                return encode;    
            }    
        } 
	catch(Exception ex) {}    
	encode = "GB2312";    
        try 
	{    
            if(str.equals(new String(str.getBytes(), encode))) 
	    {    
                return encode;    
            }    
        } 
	catch(Exception ex) {} 
	encode = "UTF-8";    
        try 
	{    
            if(str.equals(new String(str.getBytes(), encode))) 
	    {    
                return encode;    
            }    
        } 
	catch(Exception ex) {}    
        /*
	 *......待完善
	 */
        return "未识别编码格式";    
    }  
    public static void main(String[] args)
    {
	//获取系统默认编码
	System.out.println("系统默认编码：" + System.getProperty("file.encoding")); //查询结果GBK
	//系统默认字符编码
	System.out.println("系统默认字符编码：" + Charset.defaultCharset()); //查询结果GBK
	//操作系统用户使用的语言
	System.out.println("系统默认语言：" + System.getProperty("user.language")); //查询结果zh
	System.out.println();
	String s1 = "hi, nice to meet you!";
	String s2 = "hi, 我来了！";
	System.out.println(getEncoding(s1));
	System.out.println(getEncoding(s2));
	}
}

// java获取字符串编码格式
	public static String getEncoding(String str) {
		String encode = "GB2312";
		try {
			if (str.equals(new String(str.getBytes(encode), encode))) { // 判断是不是GB2312
				String s = encode;
				return s; // 是的话，返回“GB2312“，以下代码同理
			}
		} catch (Exception exception) {
		}
		encode = "ISO-8859-1";
		try {
			if (str.equals(new String(str.getBytes(encode), encode))) { // 判断是不是ISO-8859-1
				String s1 = encode;
				return s1;
			}
		} catch (Exception exception1) {
		}
		encode = "UTF-8";
		try {
			if (str.equals(new String(str.getBytes(encode), encode))) { // 判断是不是UTF-8
				String s2 = encode;
				return s2;
			}
		} catch (Exception exception2) {
		}
		encode = "GBK";
		try {
			if (str.equals(new String(str.getBytes(encode), encode))) { // 判断是不是GBK
				String s3 = encode;
				return s3;
			}
		} catch (Exception exception3) {
		}
		return "unknown"; // 如果都不是，说明输入的内容不属于常见的编码格式。
	}

        System.out.println("中文");
        System.out.println("中文".getBytes());
        System.out.println("中文".getBytes("GB2312"));
        System.out.println("中文".getBytes("ISO8859_1"));
        System.out.println(new String("中文".getBytes()));
        System.out.println(new String("中文".getBytes(), "GB2312"));
        System.out.println(new String("中文".getBytes(), "ISO8859_1"));
        System.out.println(new String("中文".getBytes("GB2312")));
        System.out.println(new String("中文".getBytes("GB2312"), "GB2312"));
        System.out.println(new String("中文".getBytes("GB2312"), "ISO8859_1"));
        System.out.println(new String("中文".getBytes("ISO8859_1")));
        System.out.println(new String("中文".getBytes("ISO8859_1"), "GB2312"));
        System.out.println(new String("中文".getBytes("ISO8859_1"), "ISO8859_1"));

//判断当前字符串的编码格式
if(destination.equals(new String(destination.getBytes("iso8859-1"), "iso8859-1")))
{
　　destination=new String(destination.getBytes("iso8859-1"),"utf-8");
}