拦截器中读取request中的流后，controller 无法获取到数据解决方案
一般我们会在InterceptorAdapter拦截器中对请求的token进行验证
如果是content-type 是 application/x-www-form-urlencoded 则没有什么问题
如果我们的接口是用@RequestBody来接受数据，那么我们在拦截器中验证token时
需要读取request的输入流 ，因为 ServletRequest中getReader()和getInputStream()只能调用一次
这样就会导致controller 无法拿到数据。
解决方法 ：
自定义一个类 BodyReaderHttpServletRequestWrapper.java
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import java.util.StringTokenizer;
import javax.servlet.ReadListener;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import com.microdata.core.util.Encodes;
public class BodyReaderHttpServletRequestWrapper extends HttpServletRequestWrapper {
private Map paramsMap;
@Override
public Map getParameterMap() {
return paramsMap;
}
@Override
public String getParameter(String name) {// 重写getParameter，代表参数从当前类中的map获取
String[] values = paramsMap.get(name);
if (values == null || values.length == 0) {
return null;
}
return values[0];
}
@Override
public String[] getParameterValues(String name) {// 同上
return paramsMap.get(name);
}
@Override
public Enumeration getParameterNames() {
return Collections.enumeration(paramsMap.keySet());
}
private String getRequestBody(InputStream stream) {
String line = "";
StringBuilder body = new StringBuilder();
int counter = 0;
// 读取POST提交的数据内容
BufferedReader reader = new BufferedReader(new InputStreamReader(stream));
try {
while ((line = reader.readLine()) != null) {
if (counter > 0) {
body.append("rn");
}
body.append(line);
counter++;
}
} catch (IOException e) {
e.printStackTrace();
}
return body.toString();
}
private HashMap getParamMapFromPost(HttpServletRequest request) {
String body = "";
try {
body = getRequestBody(request.getInputStream());
} catch (IOException e) {
e.printStackTrace();
}
HashMap result = new HashMap();
if (null == body || 0 == body.length()) {
return result;
}
return parseQueryString(body);
}
// 自定义解码函数
private String decodeValue(String value) {
if (value.contains("%u")) {
return Encodes.urlDecode(value);
} else {
try {
return URLDecoder.decode(value, "UTF-8");
} catch (UnsupportedEncodingException e) {
return "";// 非UTF-8编码
}
}
}
public HashMap parseQueryString(String s) {
String valArray[] = null;
if (s == null) {
throw new IllegalArgumentException();
}
HashMap ht = new HashMap();
StringTokenizer st = new StringTokenizer(s, "&");
while (st.hasMoreTokens()) {
String pair = (String) st.nextToken();
int pos = pair.indexOf('=');
if (pos == -1) {
continue;
}
String key = pair.substring(0, pos);
String val = pair.substring(pos + 1, pair.length());
if (ht.containsKey(key)) {
String oldVals[] = (String[]) ht.get(key);
valArray = new String[oldVals.length + 1];
for (int i = 0; i < oldVals.length; i++) {
valArray[i] = oldVals[i];
}
valArray[oldVals.length] = decodeValue(val);
} else {
valArray = new String[1];
valArray[0] = decodeValue(val);
}
ht.put(key, valArray);
}
return ht;
}
private Map getParamMapFromGet(HttpServletRequest request) {
return parseQueryString(request.getQueryString());
}
private final byte[] body; // 报文
public BodyReaderHttpServletRequestWrapper(HttpServletRequest request) throws IOException {
super(request);
body = readBytes(request.getInputStream());
// 首先从POST中获取数据
if ("POST".equals(request.getMethod().toUpperCase())) {
paramsMap = getParamMapFromPost(this);
} else {
paramsMap = getParamMapFromGet(this);
}
}
@Override
public BufferedReader getReader() throws IOException {
return new BufferedReader(new InputStreamReader(getInputStream()));
}
@Override
public ServletInputStream getInputStream() throws IOException {
final ByteArrayInputStream bais = new ByteArrayInputStream(body);
return new ServletInputStream() {
@Override
public int read() throws IOException {
return bais.read();
}
@Override
public boolean isFinished() {
return false;
}
@Override
public boolean isReady() {
return false;
}
@Override
public void setReadListener(ReadListener arg0) {
}
};
}
private static byte[] readBytes(InputStream in) throws IOException {
BufferedInputStream bufin = new BufferedInputStream(in);
int buffSize = 1024;
ByteArrayOutputStream out = new ByteArrayOutputStream(buffSize);
byte[] temp = new byte[buffSize];
int size = 0;
while ((size = bufin.read(temp)) != -1) {
out.write(temp, 0, size);
}
bufin.close();
byte[] content = out.toByteArray();
return content;
}
} 自定义Filter HttpServletRequestReplacedFilter.java
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import com.microdata.core.request.BodyReaderHttpServletRequestWrapper;
public class HttpServletRequestReplacedFilter implements Filter {
@Override
public void destroy() {
}
@Override
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
ServletRequest requestWrapper = null;
if (request instanceof HttpServletRequest) {
HttpServletRequest httpServletRequest = (HttpServletRequest) request;
if ("POST".equals(httpServletRequest.getMethod().toUpperCase())
&& httpServletRequest.getContentType().equalsIgnoreCase(
"application/json; charset=utf-8")) {
requestWrapper = new BodyReaderHttpServletRequestWrapper(
(HttpServletRequest) request);
}
}
if (requestWrapper == null) {
chain.doFilter(request, response);
} else {
chain.doFilter(requestWrapper, response);
}
}
@Override
public void init(FilterConfig arg0) throws ServletException {
}
}
在web.xml 配置
HttpServletRequestReplacedFilter
com.microdata.core.filter.HttpServletRequestReplacedFilter
encoding
utf-8
HttpServletRequestReplacedFilter
/*
Encodes 类
package com.microdata.core.util;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;
import org.apache.commons.codec.DecoderException;
import org.apache.commons.codec.binary.Base64;
import org.apache.commons.codec.binary.Hex;
import org.apache.commons.lang3.StringEscapeUtils;
/**
* 封装各种格式的编码解码工具类.
*
* 1.Commons-Codec的 hex/base64 编码
* 2.自制的base62 编码
* 3.Commons-Lang的xml/html escape
* 4.JDK提供的URLEncoder
*
*/
public class Encodes {
private static final String DEFAULT_URL_ENCODING = "UTF-8";
private static final char[] BASE62 = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz".toCharArray();
/**
* Hex编码.
*/
public static String encodeHex(byte[] input) {
return Hex.encodeHexString(input);
}
/**
* Hex解码.
*/
public static byte[] decodeHex(String input) {
try {
return Hex.decodeHex(input.toCharArray());
} catch (DecoderException e) {
throw Exceptions.unchecked(e);
}
}
/**
* Base64编码.
*/
public static String encodeBase64(byte[] input) {
return Base64.encodeBase64String(input);
}
/**
* Base64编码, URL安全(将Base64中的URL非法字符'+'和'/'转为'-'和'_', 见RFC3548).
*/
public static String encodeUrlSafeBase64(byte[] input) {
return Base64.encodeBase64URLSafeString(input);
}
/**
* Base64解码.
*/
public static byte[] decodeBase64(String input) {
return Base64.decodeBase64(input);
}
/**
* Base62编码。
*/
public static String encodeBase62(byte[] input) {
char[] chars = new char[input.length];
for (int i = 0; i < input.length; i++) {
chars[i] = BASE62[(input[i] & 0xFF) % BASE62.length];
}
return new String(chars);
}
/**
* Html 转码.
*/
public static String escapeHtml(String html) {
return StringEscapeUtils.escapeHtml4(html);
}
/**
* Html 解码.
*/
public static String unescapeHtml(String htmlEscaped) {
return StringEscapeUtils.unescapeHtml4(htmlEscaped);
}
/**
* Xml 转码.
*/
public static String escapeXml(String xml) {
return StringEscapeUtils.escapeXml(xml);
}
/**
* Xml 解码.
*/
public static String unescapeXml(String xmlEscaped) {
return StringEscapeUtils.unescapeXml(xmlEscaped);
}
/**
* URL 编码, Encode默认为UTF-8.
*/
public static String urlEncode(String part) {
try {
return URLEncoder.encode(part, DEFAULT_URL_ENCODING);
} catch (UnsupportedEncodingException e) {
throw Exceptions.unchecked(e);
}
}
/**
* URL 解码, Encode默认为UTF-8.
*/
public static String urlDecode(String part) {
try {
return URLDecoder.decode(part, DEFAULT_URL_ENCODING);
} catch (UnsupportedEncodingException e) {
throw Exceptions.unchecked(e);
}
}
}