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Hutool是一个小而全的Java工具类库，通过静态方法封装，降低相关API的学习成本，提高工作效率，使Java拥有函数式语言般的优雅，让Java语言也可以“甜甜的”。
package cn.hutool.extra.servlet;
import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.bean.copier.ValueProvider;
import cn.hutool.core.collection.ArrayIter;
import cn.hutool.core.collection.IterUtil;
import cn.hutool.core.collection.ListUtil;
import cn.hutool.core.exceptions.UtilException;
import cn.hutool.core.io.FileUtil;
import cn.hutool.core.io.IORuntimeException;
import cn.hutool.core.io.IoUtil;
import cn.hutool.core.map.CaseInsensitiveMap;
import cn.hutool.core.map.MapUtil;
import cn.hutool.core.net.NetUtil;
import cn.hutool.core.net.multipart.MultipartFormData;
import cn.hutool.core.net.multipart.UploadSetting;
import cn.hutool.core.util.ArrayUtil;
import cn.hutool.core.util.CharsetUtil;
import cn.hutool.core.util.ObjectUtil;
import cn.hutool.core.util.ReflectUtil;
import cn.hutool.core.util.StrUtil;
import cn.hutool.core.util.URLUtil;
import javax.servlet.ServletOutputStream;
import javax.servlet.ServletRequest;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.io.Writer;
import java.lang.reflect.Type;
import java.nio.charset.Charset;
import java.util.Collection;
import java.util.Collections;
import java.util.Date;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
/**
* Servlet相关工具类封装
*
* @author looly
* @since 3.2.0
*/
public class ServletUtil {
public static final String METHOD_DELETE = "DELETE";
public static final String METHOD_HEAD = "HEAD";
public static final String METHOD_GET = "GET";
public static final String METHOD_OPTIONS = "OPTIONS";
public static final String METHOD_POST = "POST";
public static final String METHOD_PUT = "PUT";
public static final String METHOD_TRACE = "TRACE";
// --------------------------------------------------------- getParam start
/**
* 获得所有请求参数
*
* @param request 请求对象{@link ServletRequest}
* @return Map
*/
public static Map getParams(ServletRequest request) {
final Map map = request.getParameterMap();
return Collections.unmodifiableMap(map);
}
/**
* 获得所有请求参数
*
* @param request 请求对象{@link ServletRequest}
* @return Map
*/
public static Map getParamMap(ServletRequest request) {
Map params = new HashMap<>();
for (Map.Entry entry : getParams(request).entrySet()) {
params.put(entry.getKey(), ArrayUtil.join(entry.getValue(), StrUtil.COMMA));
}
return params;
}
/**
* 获取请求体
* 调用该方法后，getParam方法将失效
*
* @param request {@link ServletRequest}
* @return 获得请求体
* @since 4.0.2
*/
public static String getBody(ServletRequest request) {
try (final BufferedReader reader = request.getReader()) {
return IoUtil.read(reader);
} catch (IOException e) {
throw new IORuntimeException(e);
}
}
/**
* 获取请求体byte[]
* 调用该方法后，getParam方法将失效
*
* @param request {@link ServletRequest}
* @return 获得请求体byte[]
* @since 4.0.2
*/
public static byte[] getBodyBytes(ServletRequest request) {
try {
return IoUtil.readBytes(request.getInputStream());
} catch (IOException e) {
throw new IORuntimeException(e);
}
}
// --------------------------------------------------------- getParam end
// --------------------------------------------------------- fillBean start
/**
* ServletRequest 参数转Bean
*
* @param Bean类型
* @param request ServletRequest
* @param bean Bean
* @param copyOptions 注入时的设置
* @return Bean
* @since 3.0.4
*/
public static T fillBean(final ServletRequest request, T bean, CopyOptions copyOptions) {
final String beanName = StrUtil.lowerFirst(bean.getClass().getSimpleName());
return BeanUtil.fillBean(bean, new ValueProvider() {
@Override
public Object value(String key, Type valueType) {
String[] values = request.getParameterValues(key);
if (ArrayUtil.isEmpty(values)) {
values = request.getParameterValues(beanName + StrUtil.DOT + key);
if (ArrayUtil.isEmpty(values)) {
return null;
}
}
if (1 == values.length) {
// 单值表单直接返回这个值
return values[0];
} else {
// 多值表单返回数组
return values;
}
}
@Override
public boolean containsKey(String key) {
// 对于Servlet来说，返回值null意味着无此参数
return (null != request.getParameter(key)) || (null != request.getParameter(beanName + StrUtil.DOT + key));
}
}, copyOptions);
}
/**
* ServletRequest 参数转Bean
*
* @param Bean类型
* @param request {@link ServletRequest}
* @param bean Bean
* @param isIgnoreError 是否忽略注入错误
* @return Bean
*/
public static T fillBean(ServletRequest request, T bean, boolean isIgnoreError) {
return fillBean(request, bean, CopyOptions.create().setIgnoreError(isIgnoreError));
}
/**
* ServletRequest 参数转Bean
*
* @param Bean类型
* @param request ServletRequest
* @param beanClass Bean Class
* @param isIgnoreError 是否忽略注入错误
* @return Bean
*/
public static T toBean(ServletRequest request, Class beanClass, boolean isIgnoreError) {
return fillBean(request, ReflectUtil.newInstanceIfPossible(beanClass), isIgnoreError);
}
// --------------------------------------------------------- fillBean end
/**
* 获取客户端IP
*
*
* 默认检测的Header:
*
*
* 1、X-Forwarded-For
* 2、X-Real-IP
* 3、Proxy-Client-IP
* 4、WL-Proxy-Client-IP
*
*
*
* otherHeaderNames参数用于自定义检测的Header
* 需要注意的是，使用此方法获取的客户IP地址必须在Http服务器（例如Nginx）中配置头信息，否则容易造成IP伪造。
*
*
* @param request 请求对象{@link HttpServletRequest}
* @param otherHeaderNames 其他自定义头文件，通常在Http服务器（例如Nginx）中配置
* @return IP地址
*/
public static String getClientIP(HttpServletRequest request, String... otherHeaderNames) {
String[] headers = {"X-Forwarded-For", "X-Real-IP", "Proxy-Client-IP", "WL-Proxy-Client-IP", "HTTP_CLIENT_IP", "HTTP_X_FORWARDED_FOR"};
if (ArrayUtil.isNotEmpty(otherHeaderNames)) {
headers = ArrayUtil.addAll(headers, otherHeaderNames);
}
return getClientIPByHeader(request, headers);
}
/**
* 获取客户端IP
*
*
* headerNames参数用于自定义检测的Header
* 需要注意的是，使用此方法获取的客户IP地址必须在Http服务器（例如Nginx）中配置头信息，否则容易造成IP伪造。
*
*
* @param request 请求对象{@link HttpServletRequest}
* @param headerNames 自定义头，通常在Http服务器（例如Nginx）中配置
* @return IP地址
* @since 4.4.1
*/
public static String getClientIPByHeader(HttpServletRequest request, String... headerNames) {
String ip;
for (String header : headerNames) {
ip = request.getHeader(header);
if (false == NetUtil.isUnknown(ip)) {
return NetUtil.getMultistageReverseProxyIp(ip);
}
}
ip = request.getRemoteAddr();
return NetUtil.getMultistageReverseProxyIp(ip);
}
/**
* 获得MultiPart表单内容，多用于获得上传的文件 在同一次请求中，此方法只能被执行一次！
*
* @param request {@link ServletRequest}
* @return MultipartFormData
* @throws IORuntimeException IO异常
* @since 4.0.2
*/
public static MultipartFormData getMultipart(ServletRequest request) throws IORuntimeException {
return getMultipart(request, new UploadSetting());
}
/**
* 获得multipart/form-data 表单内容
* 包括文件和普通表单数据
* 在同一次请求中，此方法只能被执行一次！
*
* @param request {@link ServletRequest}
* @param uploadSetting 上传文件的设定，包括最大文件大小、保存在内存的边界大小、临时目录、扩展名限定等
* @return MultiPart表单
* @throws IORuntimeException IO异常
* @since 4.0.2
*/
public static MultipartFormData getMultipart(ServletRequest request, UploadSetting uploadSetting) throws IORuntimeException {
final MultipartFormData formData = new MultipartFormData(uploadSetting);
try {
formData.parseRequestStream(request.getInputStream(), CharsetUtil.charset(request.getCharacterEncoding()));
} catch (IOException e) {
throw new IORuntimeException(e);
}
return formData;
}
// --------------------------------------------------------- Header start
/**
* 获取请求所有的头（header）信息
*
* @param request 请求对象{@link HttpServletRequest}
* @return header值
* @since 4.6.2
*/
public static Map getHeaderMap(HttpServletRequest request) {
final Map headerMap = new HashMap<>();
final Enumeration names = request.getHeaderNames();
String name;
while (names.hasMoreElements()) {
name = names.nextElement();
headerMap.put(name, request.getHeader(name));
}
return headerMap;
}
/**
* 获取请求所有的头（header）信息
*
* @param request 请求对象{@link HttpServletRequest}
* @return header值
* @since 6.0.0
*/
public static Map> getHeadersMap(final HttpServletRequest request) {
final Map> headerMap = new LinkedHashMap<>();
final Enumeration names = request.getHeaderNames();
String name;
while (names.hasMoreElements()) {
name = names.nextElement();
headerMap.put(name, ListUtil.list(false, request.getHeaders(name)));
}
return headerMap;
}
/**
* 获取响应所有的头（header）信息
*
* @param response 响应对象{@link HttpServletResponse}
* @return header值
*/
public static Map> getHeadersMap(HttpServletResponse response) {
final Map> headerMap = new HashMap<>();
final Collection names = response.getHeaderNames();
for (String name : names) {
headerMap.put(name, response.getHeaders(name));
}
return headerMap;
}
/**
* 忽略大小写获得请求header中的信息
*
* @param request 请求对象{@link HttpServletRequest}
* @param nameIgnoreCase 忽略大小写头信息的KEY
* @return header值
*/
public static String getHeaderIgnoreCase(HttpServletRequest request, String nameIgnoreCase) {
final Enumeration names = request.getHeaderNames();
String name;
while (names.hasMoreElements()) {
name = names.nextElement();
if (name != null && name.equalsIgnoreCase(nameIgnoreCase)) {
return request.getHeader(name);
}
}
return null;
}
/**
* 获得请求header中的信息
*
* @param request 请求对象{@link HttpServletRequest}
* @param name 头信息的KEY
* @param charsetName 字符集
* @return header值
*/
public static String getHeader(HttpServletRequest request, String name, String charsetName) {
return getHeader(request, name, CharsetUtil.charset(charsetName));
}
/**
* 获得请求header中的信息
*
* @param request 请求对象{@link HttpServletRequest}
* @param name 头信息的KEY
* @param charset 字符集
* @return header值
* @since 4.6.2
*/
public static String getHeader(HttpServletRequest request, String name, Charset charset) {
final String header = request.getHeader(name);
if (null != header) {
return CharsetUtil.convert(header, CharsetUtil.CHARSET_ISO_8859_1, charset);
}
return null;
}
/**
* 客户浏览器是否为IE
*
* @param request 请求对象{@link HttpServletRequest}
* @return 客户浏览器是否为IE
*/
public static boolean isIE(HttpServletRequest request) {
String userAgent = getHeaderIgnoreCase(request, "User-Agent");
if (StrUtil.isNotBlank(userAgent)) {
//noinspection ConstantConditions
userAgent = userAgent.toUpperCase();
return userAgent.contains("MSIE") || userAgent.contains("TRIDENT");
}
return false;
}
/**
* 是否为GET请求
*
* @param request 请求对象{@link HttpServletRequest}
* @return 是否为GET请求
*/
public static boolean isGetMethod(HttpServletRequest request) {
return METHOD_GET.equalsIgnoreCase(request.getMethod());
}
/**
* 是否为POST请求
*
* @param request 请求对象{@link HttpServletRequest}
* @return 是否为POST请求
*/
public static boolean isPostMethod(HttpServletRequest request) {
return METHOD_POST.equalsIgnoreCase(request.getMethod());
}
/**
* 是否为Multipart类型表单，此类型表单用于文件上传
*
* @param request 请求对象{@link HttpServletRequest}
* @return 是否为Multipart类型表单，此类型表单用于文件上传
*/
public static boolean isMultipart(HttpServletRequest request) {
if (false == isPostMethod(request)) {
return false;
}
String contentType = request.getContentType();
if (StrUtil.isBlank(contentType)) {
return false;
}
return contentType.toLowerCase().startsWith("multipart/");
}
// --------------------------------------------------------- Header end
// --------------------------------------------------------- Cookie start
/**
* 获得指定的Cookie
*
* @param httpServletRequest {@link HttpServletRequest}
* @param name cookie名
* @return Cookie对象
*/
public static Cookie getCookie(HttpServletRequest httpServletRequest, String name) {
return readCookieMap(httpServletRequest).get(name);
}
/**
* 将cookie封装到Map里面
*
* @param httpServletRequest {@link HttpServletRequest}
* @return Cookie map
*/
public static Map readCookieMap(HttpServletRequest httpServletRequest) {
final Cookie[] cookies = httpServletRequest.getCookies();
if (ArrayUtil.isEmpty(cookies)) {
return MapUtil.empty();
}
return IterUtil.toMap(
new ArrayIter<>(httpServletRequest.getCookies()),
new CaseInsensitiveMap<>(),
Cookie::getName);
}
/**
* 设定返回给客户端的Cookie
*
* @param response 响应对象{@link HttpServletResponse}
* @param cookie Servlet Cookie对象
*/
public static void addCookie(HttpServletResponse response, Cookie cookie) {
response.addCookie(cookie);
}
/**
* 设定返回给客户端的Cookie
*
* @param response 响应对象{@link HttpServletResponse}
* @param name Cookie名
* @param value Cookie值
*/
public static void addCookie(HttpServletResponse response, String name, String value) {
response.addCookie(new Cookie(name, value));
}
/**
* 设定返回给客户端的Cookie
*
* @param response 响应对象{@link HttpServletResponse}
* @param name cookie名
* @param value cookie值
* @param maxAgeInSeconds -1: 关闭浏览器清除Cookie. 0: 立即清除Cookie. >0 : Cookie存在的秒数.
* @param path Cookie的有效路径
* @param domain the domain name within which this cookie is visible; form is according to RFC 2109
*/
public static void addCookie(HttpServletResponse response, String name, String value, int maxAgeInSeconds, String path, String domain) {
Cookie cookie = new Cookie(name, value);
if (domain != null) {
cookie.setDomain(domain);
}
cookie.setMaxAge(maxAgeInSeconds);
cookie.setPath(path);
addCookie(response, cookie);
}
/**
* 设定返回给客户端的Cookie
* Path: "/"
* No Domain
*
* @param response 响应对象{@link HttpServletResponse}
* @param name cookie名
* @param value cookie值
* @param maxAgeInSeconds -1: 关闭浏览器清除Cookie. 0: 立即清除Cookie. >0 : Cookie存在的秒数.
*/
public static void addCookie(HttpServletResponse response, String name, String value, int maxAgeInSeconds) {
addCookie(response, name, value, maxAgeInSeconds, "/", null);
}
// --------------------------------------------------------- Cookie end
// --------------------------------------------------------- Response start
/**
* 获得PrintWriter
*
* @param response 响应对象{@link HttpServletResponse}
* @return 获得PrintWriter
* @throws IORuntimeException IO异常
*/
public static PrintWriter getWriter(HttpServletResponse response) throws IORuntimeException {
try {
return response.getWriter();
} catch (IOException e) {
throw new IORuntimeException(e);
}
}
/**
* 返回数据给客户端
*
* @param response 响应对象{@link HttpServletResponse}
* @param text 返回的内容
* @param contentType 返回的类型
*/
public static void write(HttpServletResponse response, String text, String contentType) {
response.setContentType(contentType);
Writer writer = null;
try {
writer = response.getWriter();
writer.write(text);
writer.flush();
} catch (IOException e) {
throw new UtilException(e);
} finally {
IoUtil.close(writer);
}
}
/**
* 返回文件给客户端
*
* @param response 响应对象{@link HttpServletResponse}
* @param file 写出的文件对象
* @since 4.1.15
*/
public static void write(HttpServletResponse response, File file) {
final String fileName = file.getName();
final String contentType = ObjectUtil.defaultIfNull(FileUtil.getMimeType(fileName), "application/octet-stream");
BufferedInputStream in = null;
try {
in = FileUtil.getInputStream(file);
write(response, in, contentType, fileName);
} finally {
IoUtil.close(in);
}
}
/**
* 返回数据给客户端
*
* @param response 响应对象{@link HttpServletResponse}
* @param in 需要返回客户端的内容
* @param contentType 返回的类型，可以使用{@link FileUtil#getMimeType(String)}获取对应扩展名的MIME信息
*
* - application/pdf
* - application/vnd.ms-excel
* - application/msword
* - application/vnd.ms-powerpoint
*
* docx、xlsx 这种 office 2007 格式 设置 MIME;网页里面docx 文件是没问题，但是下载下来了之后就变成doc格式了
* 参考：https://my.oschina.net/shixiaobao17145/blog/32489
*
* - MIME_EXCELX_TYPE = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
* - MIME_PPTX_TYPE = "application/vnd.openxmlformats-officedocument.presentationml.presentation";
* - MIME_WORDX_TYPE = "application/vnd.openxmlformats-officedocument.wordprocessingml.document";
* - MIME_STREAM_TYPE = "application/octet-stream;charset=utf-8"; #原始字节流
*
* @param fileName 文件名，自动添加双引号
* @since 4.1.15
*/
public static void write(HttpServletResponse response, InputStream in, String contentType, String fileName) {
final String charset = ObjectUtil.defaultIfNull(response.getCharacterEncoding(), CharsetUtil.UTF_8);
final String encodeText = URLUtil.encodeAll(fileName, CharsetUtil.charset(charset));
response.setHeader("Content-Disposition",
StrUtil.format("attachment;filename=\"{}\";filename*={}''{}", encodeText, charset, encodeText));
response.setContentType(contentType);
write(response, in);
}
/**
* 返回数据给客户端
*
* @param response 响应对象{@link HttpServletResponse}
* @param in 需要返回客户端的内容
* @param contentType 返回的类型
*/
public static void write(HttpServletResponse response, InputStream in, String contentType) {
response.setContentType(contentType);
write(response, in);
}
/**
* 返回数据给客户端
*
* @param response 响应对象{@link HttpServletResponse}
* @param in 需要返回客户端的内容
*/
public static void write(HttpServletResponse response, InputStream in) {
write(response, in, IoUtil.DEFAULT_BUFFER_SIZE);
}
/**
* 返回数据给客户端
*
* @param response 响应对象{@link HttpServletResponse}
* @param in 需要返回客户端的内容
* @param bufferSize 缓存大小
*/
public static void write(HttpServletResponse response, InputStream in, int bufferSize) {
ServletOutputStream out = null;
try {
out = response.getOutputStream();
IoUtil.copy(in, out, bufferSize);
} catch (IOException e) {
throw new UtilException(e);
} finally {
IoUtil.close(out);
IoUtil.close(in);
}
}
/**
* 设置响应的Header
*
* @param response 响应对象{@link HttpServletResponse}
* @param name 名
* @param value 值，可以是String，Date， int
*/
public static void setHeader(HttpServletResponse response, String name, Object value) {
if (value instanceof String) {
response.setHeader(name, (String) value);
} else if (Date.class.isAssignableFrom(value.getClass())) {
response.setDateHeader(name, ((Date) value).getTime());
} else if (value instanceof Integer || "int".equalsIgnoreCase(value.getClass().getSimpleName())) {
response.setIntHeader(name, (int) value);
} else {
response.setHeader(name, value.toString());
}
}
// --------------------------------------------------------- Response end
}
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