目的

在Springboot中创建过滤器，用来过滤所有POST类型请求并获取body中的参数进行校验内容是否合法；该方法仅适用于POST类型请求，因为POST和GET请求的参数位置不一样所以处理方式也不一样，如果想要实现拦截获取GET类型请求校验参数，可以参考以下示例：

Springboot中拦截GET请求获取请求参数验证合法性https://blog.csdn.net/weixin_45151960/article/details/132184917?spm=1001.2014.3001.5501

实现步骤

1、创建Filter过滤器用来过滤所有请求；

2、将PSOT类型请求中的body参数内容进行转换；

3、处理body数据进行校验：

3.1、当body数据仅为json对象时进行处理校验；

3.2、当body数据仅为json数组时进行处理校验；

3.3、当body数据为json对象且包含json数组时进行处理校验；

3.4、当body数据为json数组且包含json对象时进行处理校验；

完整代码

过滤器

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import com.boc.ljh.utils.Result;
import com.boc.ljh.utils.status.AppErrorCode;
import org.springframework.context.annotation.Configuration;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.Set;


/**
 * @Author: ljh
 * @ClassName SqlFilter
 * @Description 过滤请求内容 防止sql注入
 * @date 2023/8/8 16:15
 * @Version 1.0
 */

@WebFilter(urlPatterns = "/*", filterName = "sqlFilter")
@Configuration
public class SqlFilter implements Filter {

    @Override
    public void init(FilterConfig filterConfig) {
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        response.setContentType("application/json;charset=utf-8");
        Result result = new Result();
        result.setStatus(500);
        result.setMessage(AppErrorCode.REQUEST_DATA_FULL.message);
        String data = JSON.toJSONString(result);
        BodyReaderRequestWrapper wrapper = null;
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        if (request.getMethod().equals("POST")) {
            String contentType = request.getContentType();
            if ("application/json".equals(contentType)) {
                wrapper = new BodyReaderRequestWrapper(request);
                String requestPostStr = wrapper.getBody();
                if (requestPostStr.startsWith("{")) {
                    //解析json对象
                    boolean b = resolveJSONObjectObj(requestPostStr);
                    if (!b) {
                        response.getWriter().print(data);
                        return;
                    }
                } else if (requestPostStr.startsWith("[")) {
                    //把数据转换成json数组
                    JSONArray jsonArray = JSONArray.parseArray(requestPostStr);
                    List<String> list = JSONObject.parseArray(jsonArray.toJSONString(), String.class);
                    for (String str : list) {
                        if (str.startsWith("{")) {
                            //解析json对象
                            boolean b = resolveJSONObjectObj(requestPostStr);
                            if (!b) {
                                response.getWriter().print(data);
                                return;
                            }
                        } else {
                            boolean b = verifySql(str);
                            if (b) {
                                try {
                                    response.getWriter().print(data);
                                    return;
                                } catch (IOException e) {
                                    e.printStackTrace();
                                }
                            }
                        }
                    }
                }
            } else {
                //application/x-www-form-urlencoded
                Map<String, String[]> parameterMap = request.getParameterMap();
                for (Map.Entry<String, String[]> entry : parameterMap.entrySet()) {
                    //校验参数值是否合法
                    String[] value = entry.getValue();
                    for (String s : value) {
                        //校验参数值是否合法
                        boolean b = verifySql(s);
                        if (b) {
                            response.getWriter().print(data);
                            return;
                        }
                    }
                }
            }
        }
        if (wrapper == null) {
            filterChain.doFilter(servletRequest, servletResponse);
        } else {
            filterChain.doFilter(wrapper, servletResponse);
        }
    }

    /**
     * @Author: ljh
     * @Description: 对JSONObject对象进行递归参数解析
     * @DateTime: 14:26 2023/8/9
     * @Params:
     * @Return
     */
    private boolean resolveJSONObjectObj(String requestPostStr) {
        boolean isover = true;
        // 创建需要处理的json对象
        JSONObject jsonObject = JSONObject.parseObject(requestPostStr);
        // 获取所有的参数key
        Set<String> keys = jsonObject.keySet();
        if (keys.size() > 0) {
            for (String key : keys) {
                //获取参数名称
                String value;
                if (jsonObject.get(key) != null) {
                    value = String.valueOf(jsonObject.get(key));
                    //当value为数组时
                    if (value.startsWith("[")) {
                        //把数据转换成json数组
                        JSONArray jsonArray = JSONArray.parseArray(value);
                        for (Object o : jsonArray) {
                            if (o.toString().startsWith("{")) {
                                //解析json对象
                                boolean b = resolveJSONObjectObj(o.toString());
                                if (!b) {
                                    isover = false;
                                    break;
                                }
                            } else {
                                boolean b = verifySql(value);
                                if (b) {
                                    isover = false;
                                    break;
                                }
                            }
                        }
                    } else if (value.startsWith("{")) {
                        boolean b = resolveJSONObjectObj(value);
                        if (!b) {
                            isover = false;
                            break;
                        }
                    } else {
                        //校验参数值是否合法
                        boolean b = verifySql(value);
                        if (b) {
                            isover = false;
                            break;
                        }
                    }
                }
            }
        }
        return isover;
    }


    @Override
    public void destroy() {
    }

    /**
     * @Author: ljh
     * @Description: 校验参数非法字符
     * @DateTime: 14:26 2023/8/9
     * @Params:
     * @Return
     */
    public boolean verifySql(String parameter) {
        String s = parameter.toLowerCase();
        // 过滤掉的sql关键字，特殊字符前面需要加\\进行转义
        String badStr =
                "select|update|and|or|delete|insert|truncate|char|into|substr|ascii|declare|exec|count|master|into|drop|execute|table|" +
                        "char|declare|sitename|xp_cmdshell|like|from|grant|use|group_concat|column_name|" +
                        "information_schema.columns|table_schema|union|where|order|by|" +
                        "'\\*|\\;|\\-|\\--|\\+|\\,|\\//|\\/|\\%|\\#";

        //使用正则表达式进行匹配
        boolean matches = s.matches(badStr);
        return matches;
    }

}

解析body数据工具类

import javax.servlet.ReadListener;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.io.*;

/**
 * @Author: ljh
 * @ClassName BodyReaderRequestWrapper
 * @Description 解析body数据
 * @date 2023/8/8 16:14
 * @Version 1.0
 */

public class BodyReaderRequestWrapper extends HttpServletRequestWrapper {

    private final String body;

    public String getBody() {
        return body;
    }

    /**
     * 取出请求体body中的参数（创建对象时执行）
     *
     * @param request
     */
    public BodyReaderRequestWrapper(HttpServletRequest request) throws IOException {
        super(request);
        StringBuilder sb = new StringBuilder();
        InputStream ins = request.getInputStream();
        BufferedReader isr = null;
        try {
            if (ins != null) {
                isr = new BufferedReader(new InputStreamReader(ins));
                char[] charBuffer = new char[128];
                int readCount;
                while ((readCount = isr.read(charBuffer)) != -1) {
                    sb.append(charBuffer, 0, readCount);
                }
            }
        } finally {
            if (isr != null) {
                isr.close();
            }
        }

        sb.toString();
        body = sb.toString();
    }

    @Override
    public BufferedReader getReader() {
        return new BufferedReader(new InputStreamReader(this.getInputStream()));
    }

    @Override
    public ServletInputStream getInputStream() {
        final ByteArrayInputStream byteArrayIns = new ByteArrayInputStream(body.getBytes());
        return new ServletInputStream() {

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

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

            @Override
            public void setReadListener(ReadListener readListener) {

            }

            @Override
            public int read() {
                return byteArrayIns.read();
            }

        };
    }
}

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