增强 request 和 response 功能代码,Java代码库,德仔网

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【Java】增强 request 和 response 功能
作者:知冀 / 发布于2017/10/12/ 394
request 增强（html转义 ，中文乱码，过滤敏感字符）
package me.gacl.web.filter;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import javax.servlet.http.HttpServletResponse;

/**
* @ClassName: AdvancedFilter
* @Description: 这个过滤器是用来解决中文乱码，转义内容中的html标签，过滤内容中的敏感字符的
* @author: 孤傲苍狼
* @date: 2014-9-6 下午6:17:37
*
*/ 
public class AdvancedFilter implements Filter {

    private FilterConfig filterConfig = null;
    //设置默认的字符编码
    private String defaultCharset = "UTF-8";

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        //得到过滤器的初始化配置信息
        this.filterConfig = filterConfig;
    }

    @Override
    public void doFilter(ServletRequest req, ServletResponse resp,
            FilterChain chain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) req;
        HttpServletResponse response = (HttpServletResponse) resp;
        //得到在web.xml中配置的字符编码
        String charset = filterConfig.getInitParameter("charset");
        if(charset==null){
            charset = defaultCharset;
        }
        request.setCharacterEncoding(charset);
        response.setCharacterEncoding(charset);
        response.setContentType("text/html;charset="+charset);

        AdvancedRequest requestWrapper = new AdvancedRequest(request);
        chain.doFilter(requestWrapper, response);
    }

    @Override
    public void destroy() {

    }

    class AdvancedRequest extends HttpServletRequestWrapper{

        private List<String> dirtyWords = getDirtyWords();

        //定义一个变量记住被增强对象(request对象是需要被增强的对象)
        private HttpServletRequest request;
        //定义一个构造函数，接收被增强对象
        public AdvancedRequest(HttpServletRequest request) {
            super(request);
            this.request = request;
        }
        /* 覆盖需要增强的getParameter方法
         * @see javax.servlet.ServletRequestWrapper#getParameter(java.lang.String)
         */
        @Override
        public String getParameter(String name) {
            try{
                //获取参数的值
                String value= this.request.getParameter(name);
                if(value==null){
                    return null;
                }
                //如果不是以get方式提交数据的，就直接返回获取到的值
                if(!this.request.getMethod().equalsIgnoreCase("get")) {
                    //调用filter转义value中的html标签
                    value= filter(value);
                }else{
                    //如果是以get方式提交数据的，就对获取到的值进行转码处理
                    value = new String(value.getBytes("ISO8859-1"),this.request.getCharacterEncoding());
                    //调用filter转义value中的html标签
                    value= filter(value);
                }

                for(String dirtyWord : dirtyWords){
                    if(value.contains(dirtyWord)){
                        System.out.println("内容中包含敏感词："+dirtyWord+"，将会被替换成****");
                        //替换敏感字符
                        value = value.replace(dirtyWord, "****");
                    }
                }
                return value;
            }catch (Exception e) {
                throw new RuntimeException(e);
            }
        }
    }

    /**
    * @Method: filter
    * @Description: 过滤内容中的html标签
    * @Anthor:孤傲苍狼
    * @param value
    * @return
    */ 
    public String filter(String value) {
        if (value == null){
            return null;
        }
        char content[] = new char[value.length()];
        value.getChars(0, value.length(), content, 0);
        StringBuffer result = new StringBuffer(content.length + 50);
        for (int i = 0; i < content.length; i++) {
            switch (content[i]) {
            case '<':
                result.append("<");
                break;
            case '>':
                result.append(">");
                break;
            case '&':
                result.append("&");
                break;
            case '"':
                result.append(""");
                break;
            default:
                result.append(content[i]);
            }
        }
        return (result.toString());
    }

    /**
    * @Method: getDirtyWords
    * @Description: 获取敏感字符
    * @Anthor:孤傲苍狼
    *
    * @return
    */ 
    private List<String> getDirtyWords(){
        List<String> dirtyWords = new ArrayList<String>();
        String dirtyWordPath = filterConfig.getInitParameter("dirtyWord");
        InputStream inputStream = filterConfig.getServletContext().getResourceAsStream(dirtyWordPath);
        InputStreamReader is = null;
        try {
            is = new InputStreamReader(inputStream,defaultCharset);
        } catch (UnsupportedEncodingException e2) {
            e2.printStackTrace();
        }
        BufferedReader reader = new BufferedReader(is);
        String line;
        try {
            while ((line = reader.readLine())!= null) {//如果 line为空说明读完了
                dirtyWords.add(line);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } 
        return dirtyWords;
    }
}


<filter>
      <filter-name>AdvancedFilter</filter-name>
      <filter-class>me.gacl.web.filter.AdvancedFilter</filter-class>
      <init-param>
         <param-name>charset</param-name>    
         <param-value>UTF-8</param-value>                    //中文乱码解决
      </init-param>
      <init-param>
         <param-name>dirtyWord</param-name>    
         <param-value>/WEB-INF/DirtyWord.txt</param-value>   //敏感字符路径
    </init-param>
  </filter>

  <filter-mapping>
      <filter-name>AdvancedFilter</filter-name>
      <url-pattern>/*</url-pattern>
  </filter-mapping>



response 增强过滤压缩

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.util.zip.GZIPOutputStream;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;

/**
* @ClassName: GzipFilter
* @Description: 压缩过滤器，将web应用中的文本都经过压缩后再输出到浏览器
* @author: 孤傲苍狼
* @date: 2014-9-7 上午10:52:42
*
*/ 
public class GzipFilter implements Filter {

    public void doFilter(ServletRequest req, ServletResponse resp,
            FilterChain chain) throws IOException, ServletException {

        HttpServletRequest request = (HttpServletRequest) req;
        HttpServletResponse response = (HttpServletResponse) resp;

        BufferResponse myresponse = new BufferResponse(response);
        chain.doFilter(request, myresponse);
        //拿出缓存中的数据，压缩后再打给浏览器
        byte out[] = myresponse.getBuffer();
        System.out.println("原始大小:" + out.length);

        ByteArrayOutputStream bout = new ByteArrayOutputStream();
        //压缩输出流中的数据
        GZIPOutputStream gout = new GZIPOutputStream(bout);
        gout.write(out);
        gout.close();

        byte gzip[] = bout.toByteArray();
        System.out.println("压缩后的大小:" + gzip.length);

        response.setHeader("content-encoding", "gzip");
        response.setContentLength(gzip.length);
        response.getOutputStream().write(gzip);
    }

    public void destroy() {

    }

    public void init(FilterConfig filterConfig) throws ServletException {

    }
}

class BufferResponse extends HttpServletResponseWrapper{

    private ByteArrayOutputStream bout = new ByteArrayOutputStream();
    private PrintWriter pw;
    private HttpServletResponse response;
    public BufferResponse(HttpServletResponse response) {
        super(response);
        this.response = response;
    }
    @Override
    public ServletOutputStream getOutputStream() throws IOException {
        return new MyServletOutputStream(bout);
    }
    @Override
    public PrintWriter getWriter() throws IOException {
        pw = new PrintWriter(new OutputStreamWriter(bout,this.response.getCharacterEncoding()));
        return pw;
    }

    public byte[] getBuffer(){
        try{
            if(pw!=null){
                pw.close();
            }
            if(bout!=null){
                bout.flush();
                return bout.toByteArray();
            }


            return null;
        }catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}

class MyServletOutputStream extends ServletOutputStream{

    private ByteArrayOutputStream bout;
    public MyServletOutputStream(ByteArrayOutputStream bout){
        this.bout = bout;
    }

    @Override
    public void write(int b) throws IOException {
        this.bout.write(b);
    }
}
　　


<filter>
      <description>配置压缩过滤器</description>
      <filter-name>GzipFilter</filter-name>
      <filter-class>me.gacl.web.filter.GzipFilter</filter-class>
  </filter>

  <!--jsp文件的输出的内容都经过压缩过滤器压缩后才输出 -->
  <filter-mapping>
      <filter-name>GzipFilter</filter-name>
      <url-pattern>*.jsp</url-pattern>
      <!-- 配置过滤器的拦截方式-->
      <!-- 对于在Servlet中通过
          request.getRequestDispatcher("jsp页面路径").forward(request, response) 
      方式访问的Jsp页面的要进行拦截 -->
      <dispatcher>FORWARD</dispatcher>
      <!--对于直接以URL方式访问的jsp页面进行拦截，过滤器的拦截方式默认就是 REQUEST-->
      <dispatcher>REQUEST</dispatcher>
  </filter-mapping>
  <!--js文件的输出的内容都经过压缩过滤器压缩后才输出 -->
  <filter-mapping>
      <filter-name>GzipFilter</filter-name>
      <url-pattern>*.js</url-pattern>
  </filter-mapping>
  <!--css文件的输出的内容都经过压缩过滤器压缩后才输出 -->
  <filter-mapping>
      <filter-name>GzipFilter</filter-name>
      <url-pattern>*.css</url-pattern>
  </filter-mapping>
  <!--html文件的输出的内容都经过压缩过滤器压缩后才输出 -->
  <filter-mapping>
      <filter-name>GzipFilter</filter-name>
      <url-pattern>*.html</url-pattern>
  </filter-mapping>


response 增强缓存
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.Map;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;

/**
* @ClassName: WebResourceCachedFilter
* @Description: Web资源缓存过滤器
* @author: 孤傲苍狼
* @date: 2014-9-8 上午12:20:16
*
*/ 
public class WebResourceCachedFilter implements Filter {
    /**
    * @Field: map
    *          缓存Web资源的Map容器
    */ 
    private Map<String,byte[]> map = new HashMap<String,byte[]>();

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest req, ServletResponse resp,
            FilterChain chain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) req;
        HttpServletResponse response = (HttpServletResponse) resp;
        //1.得到用户请求的uri
        String uri = request.getRequestURI();
        //2.看缓存中有没有uri对应的数据
        byte b[] = map.get(uri);
        //3.如果缓存中有，直接拿缓存的数据打给浏览器，程序返回
        if(b!=null){
            //根据字节数组和指定的字符编码构建字符串
            String webResourceHtmlStr = new String(b,response.getCharacterEncoding());
            System.out.println(webResourceHtmlStr);
            response.getOutputStream().write(b);
            return;
        }
        //4.如果缓存没有，让目标资源执行，并捕获目标资源的输出
        BufferResponse myresponse = new BufferResponse(response);
        chain.doFilter(request, myresponse);
        //获取缓冲流中的内容的字节数组
        byte out[] = myresponse.getBuffer();
        //5.把资源的数据以用户请求的uri为关键字保存到缓存中
        map.put(uri, out);
        //6.把数据打给浏览器
        response.getOutputStream().write(out);
    }

    @Override
    public void destroy() {

    }

    class BufferResponse extends HttpServletResponseWrapper{
        private ByteArrayOutputStream bout = new ByteArrayOutputStream();  //捕获输出的缓存
        private PrintWriter pw;
        private HttpServletResponse response;
        public BufferResponse(HttpServletResponse response) {
            super(response);
            this.response = response;
        }
        @Override
        public ServletOutputStream getOutputStream() throws IOException {
            return new MyServletOutputStream(bout);
        }
        @Override
        public PrintWriter getWriter() throws IOException {
            pw = new PrintWriter(new OutputStreamWriter(bout,this.response.getCharacterEncoding()));
            return pw;
        }

        public byte[] getBuffer(){
            try{
                if(pw!=null){
                    pw.close();
                }
                return bout.toByteArray();
            }catch (Exception e) {
                throw new RuntimeException(e);
            }
        }
    }

    class MyServletOutputStream extends ServletOutputStream{
        private ByteArrayOutputStream bout;
        public MyServletOutputStream(ByteArrayOutputStream bout){  //接收数据写到哪里
            this.bout = bout;
        }
        @Override
        public void write(int b) throws IOException {
            bout.write(b);
        }
    }
}





<filter>
       <description>Web资源缓存过滤器</description>
      <filter-name>WebResourceCachedFilter</filter-name>
      <filter-class>me.gacl.web.filter.WebResourceCachedFilter</filter-class>
  </filter>

  <filter-mapping>
      <filter-name>WebResourceCachedFilter</filter-name>
      <!-- 映射需要缓存输出的JSP页面，这几个页面都只是单纯作为输入UI，不会有太多的变化，因此可以缓存输出 -->
      <url-pattern>/login.jsp</url-pattern>
      <url-pattern>/test.jsp</url-pattern>
      <url-pattern>/test2.jsp</url-pattern>
  </filter-mapping>
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