那怎么替换请求体的参数呢
时间: 2023-11-09 12:04:21 浏览: 33
如果需要替换请求体中的参数,可以在拦截器中获取请求体,对请求体中的参数进行替换,然后再将替换后的请求体设置回去。
具体实现如下:
```java
@Component
public class ReplaceParamInterceptor implements HandlerInterceptor {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
if (handler instanceof HandlerMethod) {
HandlerMethod method = (HandlerMethod) handler;
ReplaceParam annotation = method.getMethodAnnotation(ReplaceParam.class);
if (annotation != null) {
String paramName = annotation.value();
// 获取请求体
String requestBody = getRequestBody(request);
// 替换请求体中的参数
String replacedRequestBody = replaceParam(requestBody, paramName);
// 将替换后的请求体设置回去
setRequestBody(request, replacedRequestBody);
}
}
return true;
}
// 获取请求体
private String getRequestBody(HttpServletRequest request) throws IOException {
BufferedReader reader = request.getReader();
StringBuilder sb = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
sb.append(line);
}
return sb.toString();
}
// 将替换后的请求体设置回去
private void setRequestBody(HttpServletRequest request, String requestBody) throws IOException {
ServletInputStream inputStream = new ByteArrayInputStream(requestBody.getBytes());
request = new HttpServletRequestWrapper(request) {
@Override
public ServletInputStream getInputStream() throws IOException {
return inputStream;
}
@Override
public int getContentLength() {
return requestBody.getBytes().length;
}
@Override
public long getContentLengthLong() {
return requestBody.getBytes().length;
}
};
}
// 替换请求体中的参数
private String replaceParam(String requestBody, String paramName) {
// 进行参数替换的逻辑,例如将"abc"替换为"xyz"
return requestBody.replace(paramName, "xyz");
}
}
```
在上面的拦截器代码中,我们通过HttpServletRequest.getReader()方法获取到了请求体,然后用StringBuilder将其读取出来,然后再进行参数替换。最后,我们通过HttpServletRequestWrapper将替换后的请求体设置回去。
需要注意的是,由于HttpServletRequest是不可变对象,所以我们需要使用HttpServletRequestWrapper来包装一下,使其能够修改请求体。