spring利用filter进行xss过滤(包含post请求)以及请求入参日志输出

背景：过滤xss攻击，同时将过滤后的日志输出到指定文件。（指定文件输出请看上篇博文）

前景：利用filter进行xss攻击过滤，需要应对不同请求做不同的过滤处理，若是post请求的json格式数据，需要重写getinputstream方法(因为流读取一次后，下层controller无法再次进行读取。原理可自行百度)

因此需要重写两个wrapper（继承HttpServletRequestWrapper）（针对post的json请求以及其他格式的请求）

在filter中以contentType做类型的区分

未做业务耦合的区分（日志输出与xss过滤耦合到一起），若要区分开功能，单独书写即可

一:重写wrapper

1:contentType为multipart/form-data或application/x-www-form-urlencoded

public class XSSNormalRequestWrapper extends HttpServletRequestWrapper {


	public XSSNormalRequestWrapper(HttpServletRequest request) {
		super(request);
	}

	@Override
	public String[] getParameterValues(String parameter) {
		String[] values = super.getParameterValues(parameter);
		if (values == null) {
			return null;
		}
		int count = values.length;
		String[] encodedValues = new String[count];
		for (int i = 0; i < count; i++) {
			encodedValues[i] = stripXSS(values[i]);
		}
		return encodedValues;
	}

	@Override
	public String getParameter(String parameter) {
		String value = super.getParameter(parameter);
		return stripXSS(value);
	}

	@Override
	public String getHeader(String name) {
		String value = super.getHeader(name);
		return stripXSS(value);
	}

}

2:contentType为application/json

public class XSSBodyRequestWrapper extends HttpServletRequestWrapper {

    private String body;

    public XSSBodyRequestWrapper(HttpServletRequest request) {
        super(request);
        StringBuilder stringBuilder = new StringBuilder();
        BufferedReader bufferedReader = null;
        InputStream inputStream = null;
        try {
            inputStream = request.getInputStream();
            if (inputStream != null) {
                bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
                char[] charBuffer = new char[128];
                int bytesRead = -1;
                while ((bytesRead = bufferedReader.read(charBuffer)) > 0) {
                    stringBuilder.append(charBuffer, 0, by