Struts2Utils 工具类
package com.deppon.oms.module.ltlsieveorder.shared.vo;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Collection;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.commons.lang.StringUtils;
import org.apache.struts2.ServletActionContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
/**
* Struts2工具类
*
* @author 杨尚川
*/
public class Struts2Utils {
public static final Logger log = LoggerFactory.getLogger(Struts2Utils.class);
private Struts2Utils() {
};
private static final String ENCODING_PREFIX = "encoding";
private static final String NOCACHE_PREFIX = "no-cache";
private static final String ENCODING_DEFAULT = "UTF-8";
private static final boolean NOCACHE_DEFAULT = true;
private static final String TEXT_TYPE = "text/plain";
private static final String JSON_TYPE = "application/json";
private static final String XML_TYPE = "text/xml";
private static final String HTML_TYPE = "text/html";
private static final String JS_TYPE = "text/javascript";
public static HttpSession getSession() {
return ServletActionContext.getRequest().getSession();
}
public static HttpServletRequest getRequest() {
return ServletActionContext.getRequest();
}
public static HttpServletResponse getResponse() {
return ServletActionContext.getResponse();
}
public static String getParameter(String name) {
return getRequest().getParameter(name);
}
public static void render(final String contentType, final String content, final String... headers) {
try {
// 分析headers参数
String encoding = ENCODING_DEFAULT;
boolean noCache = NOCACHE_DEFAULT;
for (String header : headers) {
String headerName = StringUtils.substringBefore(header, ":");
String headerValue = StringUtils.substringAfter(header, ":");
if (StringUtils.equalsIgnoreCase(headerName, ENCODING_PREFIX)) {
encoding = headerValue;
} else if (StringUtils.equalsIgnoreCase(headerName, NOCACHE_PREFIX)) {
noCache = Boolean.parseBoolean(headerValue);
} else {
throw new IllegalArgumentException(headerName + "不是一个合法的header类型");
}
}
HttpServletResponse response = ServletActionContext.getResponse();
// 设置headers参数
String fullContentType = contentType + ";charset=" + encoding;
response.setContentType(fullContentType);
if (noCache) {
response.setHeader("Pragma", "No-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);
}
response.getWriter().write(content);
response.getWriter().flush();
} catch (IOException e) {
log.error(e.getMessage(), e);
}
}
/**
* 直接输出文本.
*
* @see #render(String, String, String...)
*/
public static void renderText(final String text, final String... headers) {
render(TEXT_TYPE, text, headers);
}
/**
* 直接输出HTML.
*
* @see #render(String, String, String...)
*/
public static void renderHtml(final String html, final String... headers) {
render(HTML_TYPE, html, headers);
}
/**
* 直接输出XML.
*
* @see #render(String, String, String...)
*/
public static void renderXml(final String xml, final String... headers) {
render(XML_TYPE, xml, headers);
}
/**
* 直接输出JSON.
*
* @param jsonString
* json字符串.
* @see #render(String, String, String...)
*/
public static void renderJson(final String jsonString, final String... headers) {
render(JSON_TYPE, jsonString, headers);
}
/**
* 直接输出JSON.
*
* @param map
* Map对象,将被转化为json字符串.
* @see #render(String, String, String...)
*/
@SuppressWarnings("unchecked")
public static void renderJson(final Map map, final String... headers) {
String jsonString = JSONObject.fromObject(map).toString();
render(JSON_TYPE, jsonString, headers);
}
/**
* 直接输出JSON.
*
* @param object
* Java对象,将被转化为json字符串.
* @see #render(String, String, String...)
*/
public static void renderJson(final Object object, final String... headers) {
String jsonString = JSONObject.fromObject(object).toString();
render(JSON_TYPE, jsonString, headers);
}
/**
* 直接输出JSON.
*
* @param collection
* Java对象集合, 将被转化为json字符串.
* @see #render(String, String, String...)
*/
public static void renderJson(final Collection<?> collection, final String... headers) {
String jsonString = JSONArray.fromObject(collection).toString();
render(JSON_TYPE, jsonString, headers);
}
/**
* 直接输出JSON.
*
* @param array
* Java对象数组, 将被转化为json字符串.
* @see #render(String, String, String...)
*/
public static void renderJson(final Object[] array, final String... headers) {
String jsonString = JSONArray.fromObject(array).toString();
render(JSON_TYPE, jsonString, headers);
}
public static void renderImage(byte[] data, String type) {
try {
HttpServletResponse response = ServletActionContext.getResponse();
response.setContentType(type);
try (OutputStream out = response.getOutputStream()) {
out.write(data, 0, data.length);
out.flush();
}
} catch (IOException e) {
log.error("渲染图像失败", e);
}
}
}