目录

定义

解决方法

思路如下： 一 定义过滤器 XssFillter继承Fillter拦截http请求

二 使用工具类继承 HttpServletRequestWrapper 进行请求转义

三 配置启动类

 四 控制层

测试

---

定义

xss是跨站攻击脚本的简写。xss的攻击方式是发生在用户使用浏览器时候运行，通过嵌入脚本窃取用户信息（如cookie等）。相比钓鱼网站更难被发现，一般是用JavaScript实现。

解决方法

一 前端设置，如使用vue 可以设置 httponly

二 后端http请求进行转义操作（这里主要介绍这一种)

思路如下：
 一 定义过滤器 XssFillter继承Fillter拦截http请求

package com.example.wechatdemo.config.xss;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
//拦截请求
@WebFilter(urlPatterns = "/*")
public class XssFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request= (HttpServletRequest) servletRequest;
        //先进行转义在把请求返回
        XssHttpServletRequestWrapper wrapper=new XssHttpServletRequestWrapper(request);
        filterChain.doFilter(wrapper,servletResponse);
    }

    @Override
    public void destroy() {

    }
}

二 使用工具类继承 HttpServletRequestWrapper 进行请求转义

HttpServletRquestWrapper继承体系如下图，工具类继承HttpServletRequestWrapper，并复写getParameterNames、getParameter、getParameterValues等方法即可简单进行http请求转义

 

import cn.hutool.core.util.StrUtil;
import cn.hutool.http.HtmlUtil;
import cn.hutool.json.JSONUtil;

import javax.servlet.ReadListener;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.io.*;
import java.nio.charset.Charset;
import java.util.LinkedHashMap;
import java.util.Map;
//思路是使用 HttpServletRequestWrapper 实现后端
public class XssHttpServletRequestWrapper extends HttpServletRequestWrapper {
    public XssHttpServletRequestWrapper(HttpServletRequest request) {
        super(request);
    }
    //提取请求参数
    @Override
    public String getParameter(String name) {
        String value= super.getParameter(name);
        if(!StrUtil.hasEmpty(value)){
            value=HtmlUtil.filter(value);
        }
        return value;
    }

    @Override
    public String[] getParameterValues(String name) {
        String[] values= super.getParameterValues(name);
        if(values!=null){
            for (int i=0;i<values.length;i++){
                String value=values[i];
                if(!StrUtil.hasEmpty(value)){
                    value=HtmlUtil.filter(value);
                }
                values[i]=value;
            }
        }
        return values;
    }

    //转义数据
    @Override
    public Map<String, String[]> getParameterMap() {
        Map<String, String[]> parameters = super.getParameterMap();
        LinkedHashMap<String, String[]> map=new LinkedHashMap();
        if(parameters!=null){
            for (String key:parameters.keySet()){
                String[] values=parameters.get(key);
                for (int i = 0; i < values.length; i++) {
                    String value = values[i];
                    if (!StrUtil.hasEmpty(value)) {
                        //导入Hutool的依赖,进行html转义
                        value = HtmlUtil.filter(value);
                    }
                    values[i] = value;
                }
                map.put(key,values);
            }
        }
        return map;
    }

    @Override
    public String getHeader(String name) {
        String value= super.getHeader(name);
        if (!StrUtil.hasEmpty(value)) {
            value = HtmlUtil.filter(value);
        }
        return value;
    }

    @Override
    public ServletInputStream getInputStream() throws IOException {
        InputStream in= super.getInputStream();
        //指定字符集编码
        InputStreamReader reader=new InputStreamReader(in, Charset.forName("UTF-8"));
        BufferedReader buffer=new BufferedReader(reader);
        StringBuffer body=new StringBuffer();
        String line=buffer.readLine();
        while(line!=null){
            body.append(line);
            line=buffer.readLine();
        }
        buffer.close();
        reader.close();
        in.close();
        Map<String,Object> map=JSONUtil.parseObj(body.toString());
        Map<String,Object> result=new LinkedHashMap<>();
        for(String key:map.keySet()){
            Object val=map.get(key);
            if(val instanceof String){
                if(!StrUtil.hasEmpty(val.toString())){
                    result.put(key,HtmlUtil.filter(val.toString()));
                }
            }
            else {
                result.put(key,val);
            }
        }
        String json=JSONUtil.toJsonStr(result);
        ByteArrayInputStream bain=new ByteArrayInputStream(json.getBytes());
        //匿名类实现IO流
        return new ServletInputStream() {
            @Override
            public int read() throws IOException {
                return bain.read();
            }

            @Override
            public boolean isFinished() {
                return false;
            }

            @Override
            public boolean isReady() {
                return false;
            }

            @Override
            public void setReadListener(ReadListener readListener) {

            }
        };
    }
}

三 配置启动类

启动类应启用servlet扫描

 四 控制层

import com.example.wechatdemo.common.util.R;
import com.example.wechatdemo.controller.form.TestFrom;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.springframework.web.bind.annotation.*;

import javax.validation.Valid;

@RestController
@RequestMapping
@Api("测试web接口")
public class TestController {
    @PostMapping("/sayhello")
    @ApiOperation("简单的测试方法")
    public R sayHello(@Valid @RequestBody TestFrom testFrom){
        return R.ok().put("message",testFrom.getName());

    }
}

测试

在swagger2测试截图如下