如何从request中获取body的数据
作者：月未明
这篇文章主要介绍了如何从request中获取body的数据问题,具有很好的参考价值,希望对大家有所帮助,如有错误或未考虑完全的地方,望不吝赐教
从request中获取body的数据
如果在controller里直接@RequestBody就可以获取，这种方式很简单，现在说下直接从request中获取。
说下场景
我是在shiro的filter中获取body中的数据：
@Override
public boolean onAccessDenied(ServletRequest servletRequest, ServletResponse response) throws Exception{
log.info("into onAccessDenied");
try {
HttpServletRequest httpServletRequest = (HttpServletRequest)servletRequest;
String str = httpServletRequest.getQueryString();
BufferedReader bufferedReader = httpServletRequest.getReader();
String bodyStr = IOUtils.read(bufferedReader);
System.out.println("bodyStr = " + bodyStr );
return true;
}catch (ExpiredCredentialsException e){
log.info("请求信息过期");
WebUtils.toHttp(response).sendError(401,"请求信息过期，操作失败");
}catch (Exception e){
log.info("请求参数不合法");
e.printStackTrace();
WebUtils.toHttp(response).sendError(401,e.getMessage());
}
return false;
}这里给出主要的相关代码，IOUtils是dubbo的一个类
相关依赖如下：
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>dubbo</artifactId>
<version>2.5.3</version>
</dependency>通过这种方式获取的是一个json字符串，
bodyStr = {
"timestamp":1523966342156
}因为我项目中没有用到dubbo，如果为了一个body的解析引入这个感觉有些不太合适，而且启动的时候也没有正常启动，所以我把这块代码抽取了出来：
package com.test.shiro.util;
import java.io.IOException;
import java.io.Reader;
import java.io.StringWriter;
import java.io.Writer;
/**
* @author Created by pangkunkun on 2018/4/20.
* 这段代码来自dubbo
*
*/
public class RequestBodyUtils {
private static final int BUFFER_SIZE = 1024 * 8;
/**
* read string.
*
* @param reader Reader instance.
* @return String.
* @throws IOException
*/
public static String read(Reader reader) throws IOException
{
StringWriter writer = new StringWriter();
try
{
write(reader, writer);
return writer.getBuffer().toString();
}
finally{ writer.close(); }
}
/**
* write.
*
* @param reader Reader.
* @param writer Writer.
* @return count.
* @throws IOException
*/
public static long write(Reader reader, Writer writer) throws IOException
{
return write(reader, writer, BUFFER_SIZE);
}
/**
* write.
*
* @param reader Reader.
* @param writer Writer.
* @param bufferSize buffer size.
* @return count.
* @throws IOException
*/
public static long write(Reader reader, Writer writer, int bufferSize) throws IOException
{
int read;
long total = 0;
char[] buf = new char[BUFFER_SIZE];
while( ( read = reader.read(buf) ) != -1 )
{
writer.write(buf, 0, read);
total += read;
}
return total;
}
}总结
以上为个人经验，希望能给大家一个参考，也希望大家多多支持脚本之家。