如何将SQL查询结果发送到jsp页面?
我有一个包含id(数字)、名称(字符串)、地址(字符串)字段的数据库 我编写了一个java程序EmployeeDAO来执行查询。我将它存储在ResultSet对象如何将SQL查询结果发送到jsp页面?,jsp,jdbc,Jsp,Jdbc,我有一个包含id(数字)、名称(字符串)、地址(字符串)字段的数据库 我编写了一个java程序EmployeeDAO来执行查询。我将它存储在ResultSet对象rs中。我需要在JSP页面中将这个结果集显示为一个表。如何将此rs发送到JSP页面 public class EmployeeDAO { public _____ list() throws Exception { try { Class.forName("sun
rs
中。我需要在JSP页面中将这个结果集显示为一个表。如何将此rs
发送到JSP页面
public class EmployeeDAO
{
public _____ list() throws Exception
{
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver").newInstance();
String url = "jdbc:odbc:employee_dsn";
Connection con = DriverManager.getConnection(url);
Statement stmt = con.createStatement();
ResultSet rs = stmt.executeQuery("Select * from emp_table");
}
catch (Exception e)
{
System.out.println(e);
}
}
}
优雅的解决方案是将结果集映射到对象列表。看看弹簧,了解如何处理这个问题
在jsp中,您可以使用
循环写出此列表。优雅的解决方案是将结果集映射到对象列表。看看弹簧,了解如何处理这个问题
在jsp中,您可以使用
循环写出此列表。首先创建Java模型类Employee,其字段与emp_表中的列相同。例如:
public class Employee {
private String name;
private String lastName;
public void setName(String name) {
this.name = name;
}
public String getName() {
return this.name;
}
public String getLastName() {
return this.lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
}
然后在方法中_list()按如下方式迭代结果集:
public List<Employee> _ list() throws Exception {
Connection con = null;
ResultSet rs = null;
List<Employee> result = new ArrayList<Employee>();
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver").newInstance();
String url = "jdbc:odbc:employee_dsn";
con = DriverManager.getConnection(url);
Statement stmt = con.createStatement();
rs = stmt.executeQuery("Select * from emp_table");
while (rs.next()) {
Employee emp = new Employee();
emp.setName(rs.getString("emp_name"));
emp.setLastName(rs.getString("emp_last_name"));
result.add(emp);
}
}
catch (Exception e)
{
System.out.println(e);
} finally {
if (null != rs) {
try { rs.close()} catch(Exception ex) {};
}
if (null != con) {
try { con.close()} catch(Exception ex) {};
}
}
return result;
}
<table>
<c:forEach var="emp" items="${empDao._list}">
<tr>
<td>${emp.name}</td>
<td>${emp.lastName}</td>
</tr>
</c:forEach>
</table>
public List\ulist()引发异常{
连接con=null;
结果集rs=null;
列表结果=新建ArrayList();
尝试
{
Class.forName(“sun.jdbc.odbc.JdbcOdbcDriver”).newInstance();
String url=“jdbc:odbc:employee\u dsn”;
con=DriverManager.getConnection(url);
语句stmt=con.createStatement();
rs=stmt.executeQuery(“从emp_表中选择*);
while(rs.next()){
员工emp=新员工();
emp.setName(rs.getString(“emp_name”);
emp.setLastName(rs.getString(“emp_last_name”);
结果:添加(emp);
}
}
捕获(例外e)
{
系统输出打印ln(e);
}最后{
如果(空!=rs){
尝试{rs.close()}catch(Exception ex){};
}
如果(空!=con){
尝试{con.close()}catch(Exception ex){};
}
}
返回结果;
}
在JSP中,您可以像这样迭代集合:
public List<Employee> _ list() throws Exception {
Connection con = null;
ResultSet rs = null;
List<Employee> result = new ArrayList<Employee>();
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver").newInstance();
String url = "jdbc:odbc:employee_dsn";
con = DriverManager.getConnection(url);
Statement stmt = con.createStatement();
rs = stmt.executeQuery("Select * from emp_table");
while (rs.next()) {
Employee emp = new Employee();
emp.setName(rs.getString("emp_name"));
emp.setLastName(rs.getString("emp_last_name"));
result.add(emp);
}
}
catch (Exception e)
{
System.out.println(e);
} finally {
if (null != rs) {
try { rs.close()} catch(Exception ex) {};
}
if (null != con) {
try { con.close()} catch(Exception ex) {};
}
}
return result;
}
<table>
<c:forEach var="emp" items="${empDao._list}">
<tr>
<td>${emp.name}</td>
<td>${emp.lastName}</td>
</tr>
</c:forEach>
</table>
${emp.name}
${emp.lastName}
首先创建Java模型类Employee,其字段与emp_表中的列相同。例如:
public class Employee {
private String name;
private String lastName;
public void setName(String name) {
this.name = name;
}
public String getName() {
return this.name;
}
public String getLastName() {
return this.lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
}
然后在方法中_list()按如下方式迭代结果集:
public List<Employee> _ list() throws Exception {
Connection con = null;
ResultSet rs = null;
List<Employee> result = new ArrayList<Employee>();
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver").newInstance();
String url = "jdbc:odbc:employee_dsn";
con = DriverManager.getConnection(url);
Statement stmt = con.createStatement();
rs = stmt.executeQuery("Select * from emp_table");
while (rs.next()) {
Employee emp = new Employee();
emp.setName(rs.getString("emp_name"));
emp.setLastName(rs.getString("emp_last_name"));
result.add(emp);
}
}
catch (Exception e)
{
System.out.println(e);
} finally {
if (null != rs) {
try { rs.close()} catch(Exception ex) {};
}
if (null != con) {
try { con.close()} catch(Exception ex) {};
}
}
return result;
}
<table>
<c:forEach var="emp" items="${empDao._list}">
<tr>
<td>${emp.name}</td>
<td>${emp.lastName}</td>
</tr>
</c:forEach>
</table>
public List\ulist()引发异常{
连接con=null;
结果集rs=null;
列表结果=新建ArrayList();
尝试
{
Class.forName(“sun.jdbc.odbc.JdbcOdbcDriver”).newInstance();
String url=“jdbc:odbc:employee\u dsn”;
con=DriverManager.getConnection(url);
语句stmt=con.createStatement();
rs=stmt.executeQuery(“从emp_表中选择*);
while(rs.next()){
员工emp=新员工();
emp.setName(rs.getString(“emp_name”);
emp.setLastName(rs.getString(“emp_last_name”);
结果:添加(emp);
}
}
捕获(例外e)
{
系统输出打印ln(e);
}最后{
如果(空!=rs){
尝试{rs.close()}catch(Exception ex){};
}
如果(空!=con){
尝试{con.close()}catch(Exception ex){};
}
}
返回结果;
}
在JSP中,您可以像这样迭代集合:
public List<Employee> _ list() throws Exception {
Connection con = null;
ResultSet rs = null;
List<Employee> result = new ArrayList<Employee>();
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver").newInstance();
String url = "jdbc:odbc:employee_dsn";
con = DriverManager.getConnection(url);
Statement stmt = con.createStatement();
rs = stmt.executeQuery("Select * from emp_table");
while (rs.next()) {
Employee emp = new Employee();
emp.setName(rs.getString("emp_name"));
emp.setLastName(rs.getString("emp_last_name"));
result.add(emp);
}
}
catch (Exception e)
{
System.out.println(e);
} finally {
if (null != rs) {
try { rs.close()} catch(Exception ex) {};
}
if (null != con) {
try { con.close()} catch(Exception ex) {};
}
}
return result;
}
<table>
<c:forEach var="emp" items="${empDao._list}">
<tr>
<td>${emp.name}</td>
<td>${emp.lastName}</td>
</tr>
</c:forEach>
</table>
${emp.name}
${emp.lastName}