1 /**
 2      * 随机产生一个被限定范围的整数
 3      * 
 4      * @param num1
 5      *            定义起始范围 num1
 6      * @param num2
 7      *            定义终止范围 num2
 8      * @return 返回一个 num1 到num2 之间的随机整数数值,且num1<num2
 9      * 
10      */
11 
12     public static int generate(int num1, int num2) {
13         boolean i = num1 <= num2;
14         int k = -1;
15         // 如果i为true，即num1<num2,返回num1到num2之间的值，否则返回-1;
16         if (i == true)
17             k = (int) (Math.random() * (num2 - num1 + 1)) + num1;
18         return k;
19 
20     }

 1 /**
 2      * 加法运算，生成加数、被加数和和组成的数组
 3      * 
 4      * @param num1
 5      *            定义起始范围 num1
 6      * @param num2
 7      *            定义终止范围 num2
 8      * @return 返回数组add，包括加数，被加数，和随机生成的第一个数与第二个整数的和， 此两个整数在num1 和num2之间
 9      */
10 
11     public static double[] addition(int num1, int num2) {
12         int first = generate(num1, num2);// 随机生成的第一个整数(加数)
13         int secound = generate(num1, num2);// 随机生成的第二个整数(被家数)
14         int result = first + secound;// 第一个整数与第二个整数相加得到的整数
15         double[] add = new double[] { first, secound, result, 0, 0 };
16         return add;
17     }

 1 /**
 2      * 减法运算，生成减数、被减数和差组成的数组
 3      * 
 4      * @param num1
 5      *            定义起始范围 num1
 6      * @param num2
 7      *            定义终止范围 num2
 8      * @return 返回数组sub[],包括减数，被减数，和第二个随机生成的数值减去第一个随机生成的数值的差
 9      *         (第一个生成数值大于第二个生成数值，此两个整数在num1 和num2之间)
10      * 
11      */
12     public static double[] subtraction(int num1, int num2) {
13         int first = generate(num1, num2);// 随机生成的第一个数(减数)
14         int secound = generate(first, num2);// 随机生成的第二个数(被减数)
15         int result = secound - first;// 第二个随机生成的数值减去第一个随机生成的数值的值
16         double[] sub = new double[] { secound, first, result, 0, 1 };
17         return sub;
18     }

 1 /**
 2      * 乘法运算，生成乘数、被乘数和积组成的数组
 3      * 
 4      * @param num1
 5      *            定义起始范围 num1
 6      * @param num2
 7      *            定义终止范围 num2
 8      * @return 返回数组，包括乘数，被乘数和随机生成的数的积此(此两个整数在num1 和num2之间
 9      */
10 
11     public static double[] multiplication(int num1, int num2) {
12         int first = generate(num1, num2);// 随机生成的第一个整数(乘数)
13         int secound = generate(num1, num2);// 随机生成的第二个整数(被乘数)
14         int result = first * secound;// 第一个整数与第二个整数相加得到的整数
15         double[] mult = new double[] { first, secound, result, 0, 3 };
16         return mult;
17 
18     }

 1 /**
 2      * 除法运算，返回除数、被除数和商数组成的数组
 3      * 
 4      * @param num1
 5      *            定义起始范围 num1
 6      * @param num2
 7      *            定义终止范围 num2
 8      * @return
 9      */
10 
11     public static double[] division2(int num1, int num2) {
12         double first = generate(num1, num2);// 随机生成的第一个整数(除数)
13         double secound = generate((int)first, num2);// 随机生成的第二个整数(被除数)
14         double result = secound / first;
15         double[] div2 = new double[] { secound, first, result, 0, 4 };
16         return div2;
17     }

 1 /**
 2      * 除法求余数运算，生成除数、被除数、积和余数组成的数组
 3      * 
 4      * @param num1
 5      *            定义起始范围 num1
 6      * @param num2
 7      *            定义终止范围 num2
 8      * @return 返回数组div,包阔除数，被除数,余数和随机生成的数两个数的商(随机生成的数第一个大于第二个数)
 9      */
10     public static double[] division(int num1, int num2) {
11 
12         int first = generate(num1, num2);// 随机生成的第一个整数(除数)
13         int secound = generate(first, num2);// 随机生成的第二个整数(被除数)
14         int result = secound / first;
15         int remainder = secound % first;
16         double[] div = new double[] { secound, first, result, remainder, 5 };
17         return div;
18     }

/**
     * 随机生成加、减、乘、除四种的数组
     * 
     * @param num5
     *            定义起始范围 num5
     * @param num6
     *            定义终止范围 num6
     * @return 随机生成的一组数组
     */

    public static double[] fourExercise(int num5, int num6) {
        final int num1 = 0;
        final int num2 = 1;
        final int num3 = 2;
        final int num4 = 3;
        int num = generate(num1, num4);
        switch (num) {
        case num1:
            double[] sub = subtraction(num5, num6);
            return sub;
        case num2:
            double[] add = addition(num5, num6);
            return add;
        case num3:
            double[] mult = multiplication(num5, num6);
            return mult;
        case num4:
            double[] div = division2(num5, num6);
            return div;
        default:
            break;
        }
        return null;
    }

  1 /**
  2      * judge方法，处理参数，并形成新的list集合的对象
  3      * 
  4      * @param exerciseNumber
  5      *            习题数量
  6      * @param exerciseType
  7      *            习题种类(加减乘除)
  8      * @param num5
  9      *            起始数值
 10      * @param num6
 11      *            结束数值
 12      * @return 返回list集合
 13      */
 14 
 15     public List<Number3> judge(int exerciseNumber, int exerciseType, int num5, int num6) {
 16         final int num1 = 0;
 17         final int num2 = 1;
 18         final int num3 = 2;
 19         final int num4 = 3;
 20         final int num7 = 4;
 21         final int num8 = 5;
 22         List<Number3> exercise = new ArrayList<Number3>();
 23         Number3 number = null;
 24         switch (exerciseType) {
 25         case num1:
 26             for (int i = 0; i < exerciseNumber; i++) {
 27                 double[] sub = subtraction(num5, num6);
 28                 number = new Number3();
 29                 number.setNum1((int) sub[0]);
 30                 number.setNum2((int) sub[1]);
 31                 number.setNum3(String.format("%.0f", sub[2]));
 32                 number.setNumType("-");
 33                 number.setSymbol("=");
 34                 exercise.add(number);
 35             }
 36             return exercise;
 37         case num2:
 38             for (int i = 0; i < exerciseNumber; i++) {
 39                 double[] add = addition(num5, num6);
 40                 number = new Number3();
 41                 number.setNum1((int) add[0]);
 42                 number.setNum2((int) add[1]);
 43                 number.setNum3(String.format("%.0f", add[2]));
 44                 number.setNumType("+");
 45                 number.setSymbol("=");
 46                 exercise.add(number);
 47             }
 48             return exercise;
 49         case num3:
 50             for (int i = 0; i < exerciseNumber; i++) {
 51                 double[] mult = multiplication(num5, num6);
 52                 number = new Number3();
 53                 number.setNum1((int) mult[0]);
 54                 number.setNum2((int) mult[1]);
 55                 number.setNum3(String.format("%.0f", mult[2]));
 56                 number.setNumType("*");
 57                 number.setSymbol("=");
 58                 exercise.add(number);
 59                 System.out.println(exercise);
 60             }
 61             return exercise;
 62         case num4:
 63             for (int i = 0; i < exerciseNumber; i++) {
 64                 double[] div = division(num5, num6);
 65                 number = new Number3();
 66                 number.setNum1((int) div[0]);
 67                 number.setNum2((int) div[1]);
 68                 number.setNum3(String.format("%.0f", div[2]));
 69                 number.setNum4(String.format("%.0f", div[3]));
 70                 number.setNumType("/");
 71                 number.setSymbol("=");
 72                 exercise.add(number);
 73             }
 74             return exercise;
 75         case num7:
 76             for (int i = 0; i < exerciseNumber; i++) {
 77                 double[] fourexercise = fourExercise(num5, num6);
 78                 number = new Number3();
 79                 System.out.println(exerciseType + "exerciseType");
 80                 if (fourexercise[4] == 0) {
 81                     number.setNum1((int) fourexercise[0]);
 82                     number.setNum2((int) fourexercise[1]);
 83                     number.setNum3(String.format("%.0f", fourexercise[2]));
 84                     number.setNumType("-");
 85                     number.setSymbol("=");
 86                 } else if (fourexercise[4] == 1) {
 87                     number.setNum1((int) fourexercise[0]);
 88                     number.setNum2((int) fourexercise[1]);
 89                     number.setNum3(String.format("%.0f", fourexercise[2]));
 90                     number.setNumType("+");
 91                     number.setSymbol("=");
 92                 } else if (fourexercise[4] == 2) {
 93                     number.setNum1((int) fourexercise[0]);
 94                     number.setNum2((int) fourexercise[1]);
 95                     number.setNum3(String.format("%.0f", fourexercise[2]));
 96                     number.setNumType("*");
 97                     number.setSymbol("=");
 98                 } else {
 99                     number.setNum1((int) fourexercise[0]);
100                     number.setNum2((int) fourexercise[1]);
101                     number.setNum3(String.format("%.6f", fourexercise[2]));
102                     number.setNum4(String.format("%.6f", fourexercise[3]));
103                     number.setNumType("/");
104                     number.setSymbol("=");
105                 }
106                 exercise.add(number);
107             }
108             return exercise;
109         case num8:
110             Number3 number2 = null;
111             for (int i = 0; i < exerciseNumber; i++) {
112                 double[] div2 = division2(num5, num6);
113                 number2 = new Number3();
114                 number2.setNum1((int) div2[0]);
115                 number2.setNum2((int) div2[1]);
116                 number2.setNum3(String.format("%.6f", div2[2]));
117                 number2.setNumType("/");
118                 number2.setSymbol("=");
119                 exercise.add(number2);
120             }
121             System.out.println(exercise);
122             return exercise;
123         default:
124             break;
125         }
126         return null;
127     }

 1    public class Number3 {
 2        private int num1;
 3        private int num2;
 4        private String num3;
 5        private String num4;
 6        private String numType;
 7        private String symbol;
 8        .....
 9  　　　//此处省略set和get方法
10  }

 1 public class Exercise {
 2     private String exerciseType;
 3     private String min;
 4     private String max;
 5     private String exerciseNumber;
 6 
 7     ......
 8 　　//此处省略get和set方法
 9 
10 
11     public String execute() {
12         ActionContext actioncontext = ActionContext.getContext();
13         Map<String, Object> session = actioncontext.getSession();
14         count cou = new count();
15         List<Number3> exercise = cou.judge(Integer.valueOf(exerciseNumber), Integer.valueOf(exerciseType),
16                 Integer.valueOf(min), Integer.valueOf(max));
17         session.put("exercises", exercise);
18         session.put("exerciseType",exerciseType);
19         if (exerciseType.equals("3")) {
20             return "d";
21         } else {
22             return "asm";
23         }
24     }
25 }