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我们都知道在 HttpServletRequest 中，URL 和 FORM 参数共存时，都会出现在 getParameterMap() 方法中，由于一些业务需要区分这两者，笔者研究了下它的类，其实也可以找到各自的区分的办法，如下。

package com.chinadaas.platform.servicecenter.mycommon.handler; import com.alibaba.fastjson.JSON;import com.google.common.collect.Maps;import lombok.Getter;import lombok.Setter;import org.springframework.web.multipart.support.StandardMultipartHttpServletRequest;import javax.servlet.ReadListener;import javax.servlet.ServletInputStream;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletRequestWrapper;import javax.servlet.http.Part;import java.io.*;import java.nio.charset.Charset;import java.util.Collection;import java.util.Map;import java.util.Objects; @Getter@Setterpublic class RequestHandler extends HttpServletRequestWrapper {     private String rawJson;     private String form;     private String query;     public static RequestHandler getInstance(HttpServletRequest request) {        if (request instanceof StandardMultipartHttpServletRequest) {            request = ((StandardMultipartHttpServletRequest) request).getRequest();        }        return (RequestHandler)request;    }     public RequestHandler(HttpServletRequest request) throws IOException {        super(request);        StringBuilder sb = new StringBuilder();        InputStream ins = request.getInputStream();        BufferedReader isr = null;        try{            // rawJson case            if(ins != null){                isr = new BufferedReader(new InputStreamReader(ins, Charset.defaultCharset()));                char[] charBuffer = new char[128];                int readCount;                while((readCount = isr.read(charBuffer)) != -1){                    sb.append(charBuffer,0,readCount);                }                setRawJson(sb.toString());            }             // check getParameterMap            Map
   
     tParamMap = request.getParameterMap();            if (!(Objects.nonNull(tParamMap) && tParamMap.size() > 0)) {                return;            }            Map
    
      paramMap = Maps.newHashMap();            tParamMap.entrySet().forEach(param -> {                /* Array T String */                String[] valArr = param.getValue();                StringBuilder sbVal = new StringBuilder();                for (String val : valArr) {                    sbVal.append(val).append(",");                }                // clean last ","                String val = sbVal.substring(0, sbVal.length()-1);                paramMap.put(param.getKey(), val);            });             // form case            // business try catch            try {                Collection
     
       parts = request.getParts();                Map
      
        form = Maps.newHashMap();                parts.forEach(part -> {                    String paramKey = part.getName();                    String paramVal = paramMap.get(paramKey);                    paramMap.remove(paramKey);                    form.put(paramKey, paramVal);                });                setForm(JSON.toJSONString(form));            }            catch (Exception e) {                e.printStackTrace();                // no form-data            }             // query case            setQuery(JSON.toJSONString(paramMap));            System.out.println(1);        }        finally {            if(isr != null) {                isr.close();            }        }    }     @Override    public ServletInputStream getInputStream() {        try {            final ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(rawJson.getBytes(Charset.defaultCharset()));            return new ServletInputStream() {                @Override                public int read() {                    return byteArrayInputStream.read();                }                 @Override                public boolean isFinished() {                    return false;                }                 @Override                public boolean isReady() {                    return false;                }                 @Override                public void setReadListener(ReadListener listener) {                 }            };        }catch (Exception e){            e.printStackTrace();            return null;        }    }     @Override    public BufferedReader getReader() {        return new BufferedReader(new InputStreamReader(this.getInputStream()));    }}
      
     
    
   

• 这里就分别获取到 URL、FORM、RAW-JSON 参数。
• 补充：也有专门获取 URL 参数的方法，request.getQueryString()。

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