SpringBoot 请求参数忽略大小写的实例

SpringBoot 请求参数忽略大小写的实例

我就废话不多说了，大家还是直接看代码吧~

import java.io.IOException;

import java.util.Collections;

import java.util.Enumeration;

import java.util.Map;

import javax.servlet.FilterChain;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebFilter;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletRequestWrapper;

import javax.servlet.http.HttpServletResponse;

import org.springframework.core.annotation.Order;

import org.springframework.util.LinkedCaseInsensitiveMap;

import org.springframework.web.filter.OncePerRequestFilter;

@Order(1)

//重点

@WebFilter(filterName = "caseInsensitiveFilter", urlPatterns = "/*")

public class CaseInsensitiveRequestParameterNameFilter extends OncePerRequestFilter {

public CaseInsensitiveRequestParameterNameFilter() {

System.out.println("CaseInsensitiveRequestParameterNameFilter.CaseInsensitiveRequestParameterNameFilter()");

}

@Override

protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)

throws ServletException, IOException {

filterChain.doFilter(new CaseInsensitiveParameterNameHttpServletRequest(request), response);

}

public static class CaseInsensitiveParameterNameHttpServletRequest extends HttpServletRequestWrapper {

private final LinkedCaseInsensitiveMap map = new LinkedCaseInsensitiveMap<>();

public CaseInsensitiveParameterNameHttpServletRequest(HttpServletRequest request) {

super(request);

map.putAll(request.getParameterMap());

}

@Override

public String getParameter(String name) {

String[] array = this.map.get(name);

if (array != null && array.length > 0)

return array[0];

return null;

}

@Override

public Map getParameterMap() {

return Collections.unmodifiableMap(this.map);

}

@Override

public Enumeration getParameterNames() {

return Collections.enumeration(this.map.keySet());

}

@Override

public String[] getParameterValues(String name) {

return this.map.get(name);

}

}

}

并在启动类上加入@ServletComponentScan注解

补充：springboot 接受大写参数时，接收值为空的解决

入参：

{

"title":"文章标题1",

"content":"文章内容22222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222",

"DOI":"123",

"PMID":"1234",

"email":"121607691@qq.com"

}

springboot 接到的DOI和PMID 为null，头字母改为小写后正常。

原因及解决

是spring 使用@requestbody 接收时遵http://循驼峰命名规则，如果希望接收非驼峰的参数可以在对映的属性上添加注解

@jsonProperty(value = "DOI")

private String DOI；

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