javaWeb 中文乱码解决方案

//一般web开发要求统一字符集，最好采用UTF-8,UTF-8所包含的字符比较全

//1,一定要先写第一条语句
request.setCharacterEncoding("utf8");

String str = request.getParameter("str");

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//2,写个工具类
public class Chinese {
    public static String toChinese(String strvalue) {
       try {
           if (strvalue == null) {
               return "";
           } else {
               strvalue = new String(strvalue.getBytes("ISO8859_1"), "UTF-8");
               return strvalue;
           }
       } catch (Exception e) {
           return "";
       }
    }
}


String str= Chinese.toChinese(request.getParameter("str"));

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//3,过滤器

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

public class EncodingFilter implements Filter {
	
	private String charset = null;

	public void destroy() {

	}

	public void doFilter(ServletRequest req, ServletResponse resp,
			FilterChain chain) throws IOException, ServletException {
		req.setCharacterEncoding(this.charset);
		chain.doFilter(req, resp);
	}

	public void init(FilterConfig arg0) throws ServletException {
		//这里的charset是从web.xml文件中获取
		this.charset = arg0.getInitParameter("charset");
	}

}



web.xml

<!-- 解决中文乱码的过滤器 -->
<filter>
<filter-name>encoding</filter-name>
<filter-class>com.filter.EncodingFilter</filter-class>
<init-param>
<param-name>charset</param-name>
<param-value>utf8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>encoding</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>