java web编程中解决字符的另一招（RequestProcessor） 博客分类： 技术 编程WebJavaServletXML

以前我都是用Filter （servlet）过滤器去 解决中文乱码（字符集）的问题 ，需要在web.xml配置2处。
但是今天 发现 RequestProcessor也可以解决字符集问题。 只需在web.xml种 配置一处 即可。
在此做个备忘！

java 代码

1. MyRequestProcessor.java
2. package StudyNews;
4. import javax.servlet.http.HttpServlet;
5. import javax.servlet.http.HttpServletRequest;
6. import javax.servlet.http.HttpServletResponse;
7. import org.apache.struts.action.RequestProcessor;
9. import org.apache.struts.config.ForwardConfig;
10. import org.apache.commons.logging.Log;
13. public class MyRequestProcessor extends RequestProcessor {
15. public MyRequestProcessor() {}
17. protected boolean processPreprocess( HttpServletRequest request,
18. HttpServletResponse response ){
20. try{
21. request.setCharacterEncoding("latin1");//此处为自己用的数据库的字符集 <4>
23. }
24. catch(Exception ex){
25. System.out.println("字符集设置失败");
27. }
29. return true;
30. }
32. }

xml

xml 代码

1. <controller processorClass="StudyNews.MyRequestProcessor" />

---------------------------------

java 代码

1. import java.io.IOException;
3. import javax.servlet.Filter;
4. import javax.servlet.FilterChain;
5. import javax.servlet.FilterConfig;
6. import javax.servlet.ServletException;
7. import javax.servlet.ServletRequest;
8. import javax.servlet.ServletResponse;
10. public class SetCharacterEncodingFilter implements Filter {
12. /*
13. * （非 Javadoc）
14. *
15. * @see javax.servlet.Filter#destroy()
16. */
17. public void destroy() {
19. this.encoding = null;
20. this.filterConfig = null;
22. }
24. public void doFilter(ServletRequest request, ServletResponse response,
25. FilterChain chain) throws IOException, ServletException {
26. // 选择使用的字符编码
27. if (ignore ¦ ¦ (request.getCharacterEncoding() == null)) {
28. String encoding = selectEncoding(request);
29. if (encoding != null) {
30. request.setCharacterEncoding(encoding);
32. }
33. // 将控制权交给下一个Filter
34. chain.doFilter(request, response);
35. }
37. }

// 将这个filter放置在服务中

java 代码

1. /*
2. * （非 Javadoc）
3. *
4. * @see javax.servlet.Filter#init(javax.servlet.FilterConfig)
5. */
6. public void init(FilterConfig filterConfig) throws ServletException {
7. this.encoding = filterConfig.getInitParameter( "encoding ");
8. String value = filterConfig.getInitParameter( "ignore ");
9. if (value == null)
10. this.ignore = true;
11. else if (value.equalsIgnoreCase( "true "))
12. this.ignore = true;
13. else if (value.equalsIgnoreCase( "yes "))
14. this.ignore = true;
15. else
16. this.ignore = false;
18. }
20. protected String selectEncoding(ServletRequest request) {
21. return (this.encoding);
22. }
24. protected String encoding = null;
26. protected FilterConfig filterConfig = null;
28. protected boolean ignore = true;
30. }

在web.xml文件中加入以下代码

xml 代码

xml 代码

 

1. <filter>  <filter-name> SetCharacterEncodingFilter </filter-name>  <filter-class> SetCharacterEncodingFilter </filter-class>  <init-param>  <param_name> encoding </param_name>  <param-value> GBK </param-value>  </init-param>  </filter>  <filter-mapping>  <filter-name> SetCharacterEncodingFilter </filter-name>  <url_pattern> /* </url_pattern>  </filter-mapping>