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springboot拦截请求的参数

前端请求的数据中,有一些数据前后空格、制表符等数据是不期望的,有一些含有非法参数,需要统一过滤这些内容。

springboot拦截请求的参数

参数获取方式

三种方式:

  1. HttpServletRequest getParameter、getParameterValues方法获取参数
  2. Controller方法自动封装的bean参数
  3. Controller方法用@RequestBody接收的json格式数据

对于1、2 重写HttpServletRequestWrapper并加入filter
对于3 重写ObjectMapper在json反序列化时过滤

重写HttpServletRequestWrapper

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  public class ParameterRequestWrapper extends HttpServletRequestWrapper {
private Logger log = LoggerFactory.getLogger(this.getClass());

private Map<String , String[]> params = new HashMap<>();

public ParameterRequestWrapper(HttpServletRequest request) {
// 将request交给父类,以便于调用对应方法的时候,将其输出,其实父亲类的实现方式和第一种new的方式类似
super(request);
//将参数表,赋予给当前的Map以便于持有request中的参数
Map<String, String[]> requestMap=request.getParameterMap();
log.trace("转化前参数:"+ JSON.toJSONString(requestMap));
this.params.putAll(requestMap);
this.handleParameterValues();
log.trace("转化后参数:"+JSON.toJSONString(params));
}
/**
* 过滤parameter
*/
private void handleParameterValues(){
Set<String> set =params.keySet();
Iterator<String> it=set.iterator();
while(it.hasNext()){
String key= it.next();
String[] values = params.get(key);
for(int i=0; i<values.length; i++) {
//过滤参数方法
values[i] = ParameterUtil.handleParam(values[i]);
}
params.put(key, values);
}
}

/**
* 重写getParameter 参数从当前类中的map获取
*/
@Override
public String getParameter(String name) {
String[]values = params.get(name);
if(values == null || values.length == 0) {
return null;
}
return values[0];
}
/**
* 重写getParameterValues
*/
@Override
public String[] getParameterValues(String name) {//同上
return params.get(name);
}

}

filter配置

filter类

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  public class ParamsFilter implements Filter {
private Logger log = LoggerFactory.getLogger(this.getClass());
@Override
public void doFilter(ServletRequest arg0, ServletResponse arg1,
FilterChain arg2) throws IOException, ServletException {
ParameterRequestWrapper parmsRequest = new ParameterRequestWrapper(
(HttpServletRequest) arg0);
arg2.doFilter(parmsRequest, arg1);
}

@Override
public void init(FilterConfig arg0) throws ServletException {
log.info("ParamsFilter init");
}

@Override
public void destroy() {
log.info("ParamsFilter destroy");
}

}

注册filter
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@Bean
public FilterRegistrationBean parmsFilterRegistration() {
FilterRegistrationBean registration = new FilterRegistrationBean();
registration.setDispatcherTypes(DispatcherType.REQUEST);
registration.setFilter(new ParamsFilter());
registration.addUrlPatterns("/*");
registration.setName("paramsFilter");
registration.setOrder(Integer.MAX_VALUE-1);
return registration;
}

这样可以处理前两种方式获取参数的情况

json格式参数

json格式SrpingMVC通过@RequestBody注解接收,需要配置全局json转换

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@Bean
@Primary
public ObjectMapper jsonObjectMapper(Jackson2ObjectMapperBuilder builder) {
//解析器
ObjectMapper objectMapper = builder.createXmlMapper(false).build();
objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
//注册xss解析器
SimpleModule xssModule = new SimpleModule("ParamStringJsonSerializer");
//json string反序列化成bean
xssModule.addDeserializer(String.class, new JsonDeserializer<String>() {
@Override
public String deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException, JsonProcessingException {
String value = jsonParser.getText();
//过滤参数方法
value = ParameterUtil.handleParam(value);
return value;
}
});
objectMapper.registerModule(xssModule);
return objectMapper;
}