package cn.dreampie.common.web.render;
import cn.dreampie.common.util.ValidateUtils;
import com.jfinal.render.Render;
import com.jfinal.render.RenderException;
import java.io.IOException;
import java.io.PrintWriter;
/**
* Created by wangrenhui on 14-4-28.
*/
public class JsonErrorRender extends Render {
private static final long serialVersionUID = -7175292712918557096L;
private static final String contentType = "application/json;charset=" + getEncoding();
private static final String contentTypeForIE = "text/html;charset=" + getEncoding();
protected static final String json404 = "404 Not Found";
protected static final String json500 = "500 Internal Server Error";
protected static final String json401 = "401 Unauthorized";
protected static final String json403 = "403 Forbidden";
protected int errorCode;
private boolean forIE = false;
public JsonErrorRender(int errorCode, String view) {
this.errorCode = errorCode;
this.view = view;
}
public void render() {
String header = request.getHeader("USER-AGENT").toLowerCase();
forIE = header.indexOf("msie") > 0 ? true : false;
response.setStatus(getErrorCode()); // HttpServletResponse.SC_XXX_XXX
// render with json
String errorJson = null;
Object error = request.getAttribute("errorJson");
if (ValidateUtils.me().isNullOrEmpty(error)) {
errorJson = getErrorJson();
} else {
errorJson = error.toString();
}
// render with html content
PrintWriter writer = null;
try {
response.setContentType(forIE ? contentTypeForIE : contentType);
writer = response.getWriter();
writer.write(errorJson);
writer.flush();
} catch (IOException e) {
throw new RenderException(e);
} finally {
if (writer != null)
writer.close();
}
}
public String getErrorJson() {
int errorCode = getErrorCode();
if (errorCode == 404)
return json404;
if (errorCode == 500)
return json500;
if (errorCode == 401)
return json401;
if (errorCode == 403)
return json403;
return errorCode + " Error";
}
public int getErrorCode() {
return errorCode;
}
}