java result是什么?让我们一起来了解一下吧!
java result是表示数据库结果集的数据表。它的完整英文名称是javax.servlet.jsp.jstl.sql.Result。如果要获得Result,我们应该先要获得Result,接着ResultSupport.toResult(rs)转化。
下面是如何得到result的具体步骤:
Statement stmt = con.createStatement(
ResultSet.TYPE_SCROLL_INSENSITIVE,
ResultSet.CONCUR_UPDATABLE);
ResultSet rs = stmt.executeQuery("SELECT a, b FROM TABLE2");
Result rst = ResultSupport.toResult(rs);预定义的Result比如:
1.dispatcher
它属于是实现类ServletDispatcherResult。在它的ResultType的实现中,调用了javax.servlet.RequestDispatcher类里面的forward(),
所以它的作用是跳转页面,同时通过它的跳转可以储存原来页面中request的数据信息。
2.redirect
它也是用来实现跳转到下一个页面的,与dispatcher不一样的是,它的特点是全新的请求,因此其数据信息是不同的。
实战演练,具体步骤如下:
import org.apache.commons.lang.StringUtils;
import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;
public class Result extends BaseDomain implements Serializable {
private String code;
private String msg;
private T data;
private Result() {
this.code = UnifyStrErrorCode.SUCCESS.getCode();
this.msg = UnifyStrErrorCode.SUCCESS.getMsg();
}
private Result(T data) {
this.code = UnifyStrErrorCode.SUCCESS.getCode();
this.msg = UnifyStrErrorCode.SUCCESS.getMsg();
this.setData(data);
}
private Result(String code, String msg) {
this.code = UnifyStrErrorCode.SUCCESS.getCode();
this.msg = UnifyStrErrorCode.SUCCESS.getMsg();
this.setCode(code);
this.setMsg(msg);
}
private Result(String code, String msg, T data) {
this.code = UnifyStrErrorCode.SUCCESS.getCode();
this.msg = UnifyStrErrorCode.SUCCESS.getMsg();
this.setCode(code);
this.setMsg(msg);
this.setData(data);
}
public Result setError(String code, String msg) {
this.setCode(code);
this.setMsg(msg);
return this;
}
public Result setError(UnifyStrErrorCode errorCode) {
this.setCode(errorCode.getCode());
this.setMsg(errorCode.getMsg());
return this;
}
public boolean isSuccess() {
return StringUtils.equals(this.getCode(), UnifyStrErrorCode.SUCCESS.getCode());
}
public static Result instance() {
return new Result();
}
public static Result instance(T data) {
return new Result(data);
}
public static Result instance(String code, String msg) {
return new Result(code, msg);
}
public static Result instance(String code, String msg, T data) {
return new Result(code, msg, data);
}
public String getCode() {
return this.code;
}
public void setCode(String code) {
this.code = code;
}
public String getMsg() {
return this.msg;
}
public void setMsg(String msg) {
this.msg = msg;
}
public T getData() {
return this.data;
}
public void setData(T data) {
this.data = data;
}
public Map toJsonMap(){
Map map = new HashMap<>();
map.put("data",this.data);
map.put("msg",this.msg);
map.put("code",this.code);
return map;
}
}以上就是小编今天的分享了,希望可以帮助到大家。